Two American citizens pleaded guilty Thursday to charges that they took part in an attack on demonstrators who were protesting the visit of the Turkish president in Washington.

Sinan Narin, 45, of McLean, Va., and Eyup Yildirim, 50, of Manchester, N.J., each entered guilty pleas during a hearing at D.C. Superior Court to one count of assault with significant bodily injury.

The protest of President Recep Tayyip Erdogan was held in Sheridan Circle, near the Turkish Embassy.

A number of people who were Turkish government employees have been accused of taking part on May 16 in attacks on protesters against Erdogan's visit.

None of them have been brought to court here to face the charges.

However, the two who pleaded guilty Thursday had no connection to the Turkish government.

At one point, people rushed from the area of the Turkish Embassy across the street to attack the demonstrators in Sheridan Circle.

Prosecutors said Narin was a limousine driver who was captured on video during the melee as he kicked protester Lusik Usoyan while she was on the ground. The assault left Usoyan unconscious on the ground and caused her to suffer a concussion, memory loss and dizziness, the plea agreement said.

Yildirim, who was visiting Washington, was accused of taking part in a second wave of attacks that followed the initial assaults on the protesters. Video footage captured Yildirim kicking Murat Yasa, 61, in the head and face as he was on the ground, the plea said.

Yasa suffered a concussion, memory loss and dizziness, along with cuts and bruises.

Court documents have said that the demonstrators in Sheridan Circle were specifically protesting Erdogan's arrests of opponents of the regime in Turkey.

The attacks occurred after Erdogan arrived at the ambassador's residence in his motorcade.

Sentencing is scheduled for March 15. The plea agreements call for one year and one day of jail time, prosecutors said.