The United States on Monday confirmed that an Israeli airstrike in Gaza last week killed senior Hamas commander Marwan Issa.

“Hamas’s number three, Marwan Issa, was killed in an Israeli operation last week,” U.S. National Security Advisor Jake Sullivan said during a White House press briefing.

“The rest of the top leaders are in hiding, likely deep in the Hamas tunnel network, and justice will come for them too. We are helping to ensure that,” he added.