“A written and verbal protest was delivered due to the aggressive and unprofessional actions taken, contrary to diplomatic rules and practices, by U.S. security personnel,” Turkey’s Ministry of Foreign Affairs said Monday in an official statement.

Just what were these aggressive and unprofessional actions, according to the Turkish officials? On Tuesday, members of Turkish PM Recep Erdogan's security detail attacked a group of pro-Kurdish and Armenian protesters who were gathered outside the Turkish ambassador's residence. Local D.C. police quickly intervened to stop them.

Eleven people were injured, including a police officer, and two Turkish officials were briefly taken into custody, then reportedly released due to diplomatic immunity.

Both majority Muslim Kurds and majority Christian Armenians have longstanding grievances with the Turkish government. Armenians take issue with Turkey's history of backing Azerbaijani territorial claims. Kurds have long protested what they view as second-class standing in Turkey and Turkey's extremely strong opposition to the creation of an independent Kurdish state.

The Turkish foreign ministry did not go into specifics of how they thought D.C. metro police should have handled the incident, which occurred outside the Turkish embassy grounds.