LONDON — Britain announced today it had revoked a royal wedding invitation to the Syrian ambassador because of violent attacks on protesters by the regime there.

Human rights groups had criticized the decision to invite Ambassador Sami Khiyami to Prince William and Kate Middleton’s nuptials at Westminster Abbey.

More than 450 people have been killed since last month in the uprising against President Bashar Assad’s authoritarian regime, with 120 dead over the weekend, according to the U.N.

The government said ambassadors from all countries that Britain has “normal diplomatic relations” had been invited to the wedding— some 185 in all.