DUBAI, United Arab Emirates (AP) — Yemen’s Houthi rebels claimed Monday they shot down another American-made MQ-9 Reaper drone over the country, with videos purportedly showing a surface-to-air missile striking it. The U.S. military did not immediately acknowledge losing any aircraft.

The strike on power stations and a seaport, which killed four people, was the second known time that Israel has retaliated against the militant group’ attacks by striking in Yemen.

The Israeli army targeted a power plant and ports in Yemen in revenge for Houthi missile attacks, marking a fresh exchange in another front of the regional conflict. In a statement, the IDF said it had conducted a “large-scale air operation” with dozens of air force aircraft, including fighter jets and intelligence planes.