Britain's main opposition Labour Party has passed a motion strongly criticizing Israel, as a senior lawmaker warned the party must root out anti-Semitism.

Delegates at the party's conference voted Tuesday to criticize Israel's use of force against Gaza protests, urge more U.K. funding for the U.N. agency for Palestinians and back a freeze on British arms sales to Israel.

The vote came after a heated debate that saw Palestinian flags waved in the convention hall.

Labour has been riven by allegations that the party has become hostile to Jews under leader Jeremy Corbyn, a longtime supporter of Palestinians.

Foreign-affairs spokeswoman Emily Thornberry said Labour must kick out "sickening individuals ... who use our legitimate support for Palestine as a cloak and a cover for their despicable hatred of Jewish people."