Thousands of people are taking part in a pro-Palestinian protest in London for the second consecutive weekend.
The Met Police estimated up to 100,000 people had joined the march, which was due to end in a rally near Downing Street, as of 14:00 BST.
Smaller demos took place in Birmingham, Belfast, Cardiff and Salford.
It comes as aid deliveries reached Gaza for the first time since Israel imposed a blockade following a Hamas attack that killed 1,400 people in Israel.
Palestinian officials say more than 4,000 people have since died in Israeli bombing.
The Met Police said more than 1,000 officers were involved in policing the London event.