NATO Secretary-General Jens Stoltenberg said on Saturday, responding to a request from the Croatian prime minister, that he would work together with the Croatian authorities in establishing the facts of a drone crash in Zagreb on Thursday night.

“I spoke with Croatia’s PM Andrej Plenkovic on yesterday’s drone incident in Zagreb. We agreed to stay in close contact and work together to establish the facts, Stoltenberg said on Twitter.

Earlier today, Plenkovic asked Stoltenberg that NATO investigate the entry and crash of the drone.