US President Joe Biden's administration paused a shipment of weapons to Israel last week in opposition to apparent moves by the Israelis to invade the southern Gaza city of Rafah, a senior administration official said on Tuesday.
Biden has been trying to head off a full-scale assault by the Israelis against Rafah, where hundreds of thousands of Palestinian have sought refuge from combat elsewhere in Gaza.
The official, speaking on condition of anonymity, said that as Israelis leaders seemed to approach a decision on a Rafah incursion, "we began to carefully review proposed transfers of particular weapons to Israel that might be used in Rafah" beginning in April.
Four sources said the shipments, which have been delayed for at least two weeks, involved Boeing-made Joint Direct Attack Munitions, which convert dumb bombs into precision-guided ones, as well as Small Diameter Bombs.
The delay comes at a time when Washington is publicly pressuring Israel to postpone its planned offensive in Rafah until after it has taken steps to avert civilian casualties.
The White House and Pentagon declined comment.
A senior Israeli official, speaking to Reuters on condition of anonymity, did not confirm any specific hold-up in arms supplies but appeared to take the reports in stride. “As the prime minister has already said, if we have to fight with our fingernails, then we’ll do what we have to do.”
Meanwhile, Israel reopened the Kerem Shalom crossing on its border with the Gaza Strip on Wednesday, a statement from the Israeli agency in charge of it said, adding that aid trucks routed through from Egypt were already undergoing security inspections there.
Israel had closed Kerem Shalom crossing on Sunday after a Palestinian shelling attack nearby killed four soldiers.

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