White House Press Secretary Josh Earnest has issued the Obama administration’s toughest critique yet of Israeli conduct in the ongoing conflict with Hamas in Gaza, saying Thursday that the Israeli shelling of a U.N. school-turned-shelter for Palestinian civilians was “totally indefensible.” Addressing reporters, Earnest quoted U.N. Secretary General Ban Ki-moon that “all available evidence points to Israeli artillery as the cause” of the attack, which took place early Wednesday morning.