The attack occurred at the Allenby Bridge crossing with Jordan.
As the Israel-Hamas war continues, the latest round of cease-fire discussions appears to have reached an impasse.
Meanwhile, after six hostages were found dead in Gaza, protests erupted in Israel. Protesters have lashed out at Prime Minister Benjamin Netanyahu and demanded the government bring the hostages home.
The polio vaccination campaign in Gaza is making "great progress," according to United Nations Relief and Works Agency for Palestine Refugees in the Near East Commissioner-General Philippe Lazzarini.
The World Health Organization said the next phase of the campaign begins Thursday in southern Gaza targeting an estimated 340,000 children under 10.
The Palestinian Ministry of Health said that at least 39 people have been killed and 145 injured in the West Bank over the past week, amid Israel's major -- and still unfolding -- operation there.
Those casualties bring the total number of deaths in the West Bank since Oct. 7 to at least 691, with an estimated 5,700 injured.
-ABC News' Nasser Atta, Joe Simonetti and David Brennan
Israeli Foreign Minister Israel Katz has called on his compatriots to "remain strong and united" as anti-government and cease-fire protests roil the nation.
"Anyone who cold-bloodedly murders six hostages is not seeking a deal," Katz said, referring to Hamas.
"Hamas must pay a heavy price for this horrific crime -- Israel will respond with full force."
Katz's tweet appeared to reference an Axios article published Wednesday suggesting growing White House doubt that Hamas wants to secure a deal, following the recent killing of six Gaza hostages -- including American-Israeli citizen Hersh Goldberg-Polin.
-ABC News' Jordana Miller and David Brennan
Hamas again accused Prime Minister Benjamin Netanyahu of sabotaging cease-fire and hostage release negotiations.
"We do not need new proposals. What is required now is to pressure Netanyahu and his government and oblige them to what has been agreed upon," the group said on its official Telegram channel on Wednesday night.
"We warn against falling into Netanyahu's trap and tricks, as he uses negotiations to prolong the aggression against our people," the group said.
Netanyahu's insistence on retaining military control over the Philadelphi Corridor along the Gaza-Egypt frontier has been cited by Hamas -- and on Wednesday by a U.S. official -- as a key obstacle to any deal.
The prime minister's decision to keep Israeli forces there "aims to thwart reaching an agreement," the group wrote.
Netanyahu has blamed Hamas for the failure to reach an agreement, citing its recent killing of six hostages in Gaza as proof that the group does not intend to reach an accord.
-ABC News' David Brennan
