LONDON — The Tower of London was closed after a video appeared to show activists smearing food on a display case containing one of Britain’s crown jewels.

Police said four protesters had been arrested following the incident just before 10 a.m. local time (5 a.m. ET) on Saturday, after reports that food had been thrown onto the case containing the State Crown.

“Officers worked closely with City of London Police and security officers and four people have been arrested on suspicion of criminal damage. They have taken into custody,” London’s Metropolitan Police said.

A video appears to show substances being smeared against the glass display case containing the State Crown at the Tower of London on Dec. 6.

Handout/Take Back Power

“The Tower has been closed to the public while the police i

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