NAIROBI, Kenya — American officials on Wednesday said that a team from the International Criminal Court was on its way to Rwanda to collect a war crimes suspect who had turned himself in to the American Embassy and that they were hoping Rwanda would cooperate.

Rwanda has indicated that it would not interfere with the transfer of the suspect, Bosco Ntaganda, a rebel commander nicknamed the Terminator, to the International Criminal Court at The Hague, where he has been charged with war crimes and crimes against humanity.

On Monday, Mr. Ntaganda, who has been accused of massacring villagers and recruiting child soldiers in the eastern Democratic Republic of Congo, showed up unexpectedly at the American Embassy in Rwanda and surrendered. On Wednesday, Assistant Secretary of State Johnnie Carson reiterated that the United States now needed Rwanda’s cooperation to get Mr. Ntaganda to The Hague....