Seven people were arrested after a second day of protests outside the Israeli Embassy in west London over Israel's air raids on Gaza.
The arrests were for public order offences including assaulting police. Objects were hurled at the embassy and a cone and policeman's hat set alight.
The BBC's Colette McBeth said there were "at least 500, perhaps more" people outside the Kensington building.
There were 10 arrests for public order offences at a protest there on Sunday.
Ms McBeth said Monday's protest blocked the road outside the embassy and brought traffic to a standstill.
The British government will have to do something
Ahmed Saif
Protester
She said she saw the objects being thrown towards the Israeli embassy and a traffic cone and a police helmet set alight.
However Ms McBeth added that by about 1900 GMT the number of protesters had dwindled to a "hardcore" of about 100 and the overall level of conflict with police had been lower than on the first day of protests.
