A dozen members of Turkish President Recep Tayyip Erdogan’s security detail will face charges for their involvement in a violent attack on protestors in Washington, D.C., last month, two U.S. officials told The New York Times.

D.C. police planned to announce the charges on Thursday, according to the report, which said the State Department and Secret Service had also investigated the incident.

The charges come a month after a number of people were injured when Turkish government security forces charged protestors in front of the Turkish ambassador’s residence.

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It is the most retaliatory effort taken by the U.S. following the clash. The Trump administration has been forced to proceed carefully in handling the incident involving Turkey, a key NATO ally.

While lawmakers from both parties condemned the attack, the State Department said last month that it was "concerned" by the incident and summoned the Turkish ambassador for a meeting with a senior U.S. official.