Extracto:The museum says capacity is limited, with members and those who already hold tickets given priority.
Customers who already hold tickets for this weekend have been contacted ahead of their visit.
The British Museum - which holds items including the Rosetta Stone, the Anglo-Saxon ship burial at Sutton Hoo and the contested Parthenon Sculptures - sees millions of people go through its doors each year to see the permanent collections and exhibitions.
Last year it was named the top UK visitor attraction, having had 5,820,860 visitors in 2023.
There are currently three temporary exhibitions, including Silk Roads and Picasso: Printmaker.
The museum said it apologised for any inconvenience and asked customers to contact its box office to reschedule their visits or have tickets refunded.
The Metropolitan Police has been contacted for comment.
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