Police issued warrants for two Canadian citizens and had already arrested four people, bringing the total amount charged to 18.
Newsham said the warrants were issued with the help of the state department, the U.S. secret service and the USA attorney's office in DC. Another man, Sinan Narin, was arrested in Virginia on an aggravated assault charge, the Metropolitan Police Department said. Kheirabaoi was charged with misdemeanor assault on a police officer, and Necmi was charged with felony aggravated assault.
Erdogan's security detail returned with him to Turkey and the United States could seek their extradition or bar them from entering the country. Charges have been filed, but without extradition, it's unclear what can actually be done about the felony and misdemeanor counts levied against the Turkish citizens in Erdogan's employ.
Some Turkish security officials were briefly detained at the time by US law enforcement for their role in the brawl, but they were released on the scene because "customary worldwide law affords heads of state and members of their entourage with inviolability from arrest and detention", a State Department official told ABC News at the time.
Erdogan's entire security detail left the country with him, soon-after.
The 12 men named in the warrants were identified in detailed video footage of the assault, said Washington Police Chief Peter Newsham.
Police have spent the weeks since the melee identifying suspects with video technology.
Video of the fracas shows Turkish security aides beating demonstrators and kicking those some on the ground repeatedly in the head. The company did not return a request for comment.
Coming nearly a month after the incident, the charges are the most significant retaliatory step taken to date by USA authorities, who have fumed privately and publicly over what they see as a highly offensive attack on free speech - not to mention United States law enforcement.
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Eleven people were injured in the brawl described by Washington's police chief as a "brutal attack" on protesters. "If they attempt to enter the United States they will be arrested", Newsham said.
The Turkish government agents, joined by some civilian supporters of Erdogan's AK Party, then charge across the street as Washington police officers struggle to hold them back.
A spokesman for the U.S. Attorney's Office in New Jersey confirmed that Yildirim made his first appearance before a judge there on Wednesday.
"We don't have any information right now to suggest that we have probable cause to make an arrest of the president", Newsham said.
The embassy alleged that demonstrators had been "aggressively provoking Turkish-American citizens who had peacefully assembled to greet the president".
"If they attempt to enter the US, they will be arrested", Newsham said, calling on the suspects to turn themselves in.
Last month, a protest outside the Turkish ambassador's residence in Washington D.C. turned bloody when pro-Erdogan security forces roughed up the activists outside.
Turkish President's guards intervened in a group of protestors in front of the Turkish Ambassador's Residence in Washington on May 16 while the group was chanting slogans against Erdogan.