First on CNN: Additional Marines arrive at U.S. Embassy in Baghdad

Twenty-five additional heavily armed U.S. Marines arrived at the U.S. embassy in Baghdad within the last several hours, a U.S. official tells CNN.

The Marines were requested by the State Department, which is in charge of security.

Concerns have risen since demonstrations occurred there last week in Baghdad’s “Green Zone,” where the embassy is located.

More demonstrations had been expected Friday but the U.S. official said the area has remained peaceful so far.

Neither the Pentagon or State Department disclosed the precise number of security forces already on site.

Sailors from the United States and Sri Lanka swim near the Tokai Maru, a sunken Japanese freighter from World War II, during a diving exercise in Guam on Wednesday, April 13.

A U.S. Navy officer signals to an EA-18G Growler on the flight deck of the USS Dwight D. Eisenhower on Monday, April 11. The aircraft carrier was in the Atlantic Ocean preparing for a scheduled deployment.

Mourners in full headdress attend the funeral of Joe Medicine Crow, a historian, U.S. veteran and the Crow Tribe's last surviving war chief, on Wednesday, April 6. He was 102 years old.

A B-52 bomber flies over Paris on Wednesday, April 20, as it takes part in an aerial parade that honored the 100th anniversary of the Lafayette Escadrille. The Lafayette Escadrille was largely made up of American pilots who volunteered to fight for France before the United States entered World War I.

U.S. Rep. Charles Rangel, right, listens to retired Army Col. John Palese before a medal ceremony in Washington on Wednesday, April 13. The Congressional Gold Medal was awarded to Palese and other members of the 65th Infantry Regiment -- a Puerto Rican unit that served in World War I, World War II and the Korean War.

Disabled U.S. veterans take part in a curling camp in Denver on Thursday, April 14.

A man waves life jackets next to a "help" sign made up of palm fronds in this photo released by the U.S. Navy on Sunday, April 10. The Navy and Coast Guard rescued three castaways who had been stranded on Fanadik Island for three days. The remote Pacific island, part of the Federated States of Micronesia, is about 2,600 miles southwest of Honolulu.

U.S. soldiers watch paratroopers take part in a training jump near Grafenwoehr, Germany, on Tuesday, April 12. The paratroopers were American, British and Italian.

A U.S. Marine hugs a loved one after recruits were released to their families in San Diego on Thursday, April 28. Graduation was the next day.

Soldiers and rescue personnel from the Texas Army National Guard help stranded residents during severe flooding in Wharton, Texas, on Thursday, April 21.

Sailors fire weapons during a training exercise near Fort Knox, Kentucky, on Sunday, April 17.

U.S. Vice President Joe Biden steps off a military transport plane upon arriving in Baghdad, Iraq, on Thursday, April 28. Biden was making an unannounced trip to meet with political leaders.

Sailors try to corral a large American flag before the home opener of the Chicago White Sox on Friday, April 8.

Urbana Warfel, 81, places a rose on the casket of her brother, Army Sgt. Wilson Meckley Jr., during his burial ceremony Monday, April 4, at Arlington National Cemetery. Meckley, from Lancaster, Pennsylvania, was declared dead during the Korean War, but his body was never found. Through DNA testing, it was determined that his remains were among those returned to the United States between 1990 and 1994.

The U.S. Navy's Blue Angels fly in formation during a demonstration in Fort Worth, Texas, on Sunday, April 24. The squadron is scheduled to perform 66 demonstrations in 34 U.S. locations this year.

Cmdr. Joseph L. Coffey, a chaplain with the U.S. Navy, baptizes a child aboard the USS Ronald Reagan on Sunday, April 24. The aircraft carrier is docked in Yokosuka, Japan.

U.S. Marines take part in a training exercise in Camp Lejeune, North Carolina, on Wednesday, April 20.

U.S. President Barack Obama gives a fist-bump at the start of the Wounded Warrior Ride in Washington on Thursday, April 14.

Engineman 2nd Class Shanice Floyd, a recruit division commander, ensures the proper fit of Megan Marte's hat during uniform issue Monday, April 4, in Great Lakes, Illinois. Marte was among the first female recruits to be issued the "Dixie cup" hat as part of the Navy's efforts at gender equality.

U.S. Sen. Marco Rubio speaks at a Miami event honoring veterans on Sunday, April 17, the 55th anniversary of the Bay of Pigs invasion.

Marine Gunnery Sgt. Chris Willingham, right, appears on a morning show in London with Lucca, a retired military dog who lost her leg when an IED detonated underneath her in 2012. Lucca successfully completed 400 missions and protected the lives of thousands of troops during her six years of service, according to a statement from The People's Dispensary for Sick Animals, a British organization known as PDSA. She was given the PDSA Dickin Medal, the highest honor animals can receive for their military service.

U.S. military members in New Delhi remove a flag Wednesday, April 13, after a ceremony paid respects to American crew members who crashed in a B-24 bomber during World War II. The plane was flying over the Himalayas when it went missing in 1944. What is thought to be the remains of one or two crew members were being returned to the United States.

Amelia McNab, 2, sleeps inside a military transport plane Friday, April 1, at Baltimore-Washington International Airport. The U.S. military ordered military family members to evacuate southern Turkey because of security concerns, the Pentagon said. A U.S. official said the evacuation was made because of the ongoing threats concerning possible ISIS attacks.

An unarmed Russian fighter jet flies close to the USS Donald Cook, which was sailing in the Baltic Sea. It was one of two close encounters in early April, and the U.S. Embassy in Moscow communicated formal concerns to the Russian government about the incidents, according to White House Press Secretary Josh Earnest.

Army soldiers climb over an 8-foot wall in Fort Mitchell, Alabama, as they take park in the 33rd annual Best Ranger Competition on Saturday, April 16. The three-day event tested competitors' physical, mental and technical capabilities.

U.S. President Barack Obama looks at a ring that was given to him by the Navy football team on Wednesday, April 27. The team was at the White House to receive the Commander-in-Chief's Trophy, which is awarded annually to the winner of the college football series between Navy, Army and Air Force.

Members of the 374th Maintenance Squadron pull a C-130 Hercules at Yokota Air Base in Japan on Friday, April 15. It was part of a Maintenance Rodeo Competition that pits squadrons against one another.

U.S. Secretary of State John Kerry talks with members of the Coast Guard as he tours a base in Manama, Bahrain, on Thursday, April 7.

Two military transport planes prepare to drop soldiers during a tactical exercise in Fort Bragg, North Carolina, on Friday, April 15.

U.S. military photos from April

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