Families of Israeli hostages held in Gaza and a former captive have condemned the U.K. government’s announcement that it will recognize a Palestinian state this September unless Israel meets specific conditions, calling the move a dangerous concession to terrorism.

Britain has announced it will recognize a Palestinian state in September unless Israel agrees to a ceasefire in Gaza, stops building settlements in the West Bank, and commits to a two-state solution.

British Prime Minister Keir Starmer said Israel must take “substantive steps” to improve the situation in Gaza before September.