Hundreds of thousands of people marched through central London in a pro-Palestinian march on Saturday demanding a permanent ceasefire, a day after the exchange of hostages held in Gaza for prisoners held in Israel amid a four-day temporary ceasefire. Protesters old and young chanted for a ceasefire as they marched down Park Lane to Whitehall, some draped with Palestinian flags, donning keffiyehs and armed with “Free Palestine” signs and olive branches. Organisers of Saturday’s march, which has drawn hundreds of thousands of demonstrators to London’s streets and elsewhere in the UK since the conflict began, said the temporary truce showed...