U.S. President Joe Biden has blamed Hamas for the Gaza hospital blast that killed at least 500 Palestinians.

Joe Biden arrived in Israel on Wednesday pledging solidarity in its war against Hamas.

Speaking alongside Israeli Prime Minister Benjamin Netanyahu, Biden said, “I was deeply saddened and outraged by the explosion of the hospital in Gaza yesterday, and based on what I’ve seen, it appears as though it was done by the other team, not you.”

“But there’s a lot of people out there not sure, so we’ve got a lot, we’ve got to overcome a lot of things,” Biden added.

“The world is looking. Israel has a value set like the United States does, and other democracies, and they are looking to see what we are going to do.”

Palestinian officials blamed an Israeli air strike for the blast, which it said had killed as many as 500 people. Israel said the blast was caused by a failed rocket launch by the Palestinian Islamic Jihad militant group, which denied blame.