The U.S. Embassy in Congo said Monday that Congolese authorities have not shared details or provided access to the Americans who were arrested following a coup attempt last month, following pleas for help from one family trying to confirm whether their son is alive.

Congo’s army has released the names of three Americans accused of having a role in the attack led by little-known opposition figure Christian Malanga on May 19. The State Department says one of its highest priorities is providing consular assistance to Americans detained abroad, including regular visits to ensure medical care and assisting with finding an English-speaking lawyer.

“We have requested DRC authorities grant consular access to any U.S. citizens who may have been detained and have not received it to date,” U.S. embassy spokesperson Greg Porter said in an email to The Associated Press.

Congolese authorities did not immediately respond. They have declined to say whether the Americans will appear in court. An army spokesman has said more details will come later.

Malanga, who in the past declared himself Congo’s president in exile, live-streamed the attempt to overthrow the government with his Utah-born son, Marcel Malanga, as they threatened President Felix Tshisekedi from inside the presidential palace. Malanga was shot dead for resisting arrest, the Congolese army said. In all, six people were killed and dozens arrested.