Israeli warplanes struck Gaza’s crowded southern city of Rafah Thursday after US President Joe Biden vowed to stop supplying artillery shells and other weapons to Israel if a full-scale assault goes ahead. It was the starkest warning yet from the United States, Israel’s main military provider, over the civilian impact of its war on the enclave. An AFP correspondent and witnesses on Thursday reported Israeli strikes on several parts of Rafah, where the United Nations said 1.4 million people were sheltering. “The tanks and jets are striking,” Tarek Bahlul said on a deserted Rafah street. “Every …