U.S. Secretary of State Antony Blinken says he has not seen any Israeli evidence of Hamas operating in a Gaza office building hit by airstrike over the weekend that housed The Associated Press and other media. Blinken says he has asked Israel for justification for the strike. He spoke as pressure is increasing from U.S. lawmakers seeking a ceasefire in the Israeli-Palestinian conflict. President Joe Biden has given no signs of stepping up public pressure on Israel to agree to an immediate cease-fire. Israel has carried out hundreds of airstrikes across Gaza and militants have launched more than 3,100 rockets into Israel since the fighting began.