Jerusalem (CNN) -- A Palestinian was killed after Israel bombed two tunnels in the south of Gaza, Palestinian medical officials said on Friday.
Israel -- which also bombed a weapons storage facility in northern Gaza -- said its strike was in response to mortars that were fired into Israel and hit a government building in the southern district.
A search is going on for another Palestinian thought to be in the rubble.
In a statement, Israel Defense Forces (IDF) said it "remains committed to protecting" Israeli citizens against terror.
"The IDF holds Hamas solely responsible for terror emanating from the Gaza Strip," the statement said.