Police say they are reinforcing security around the American Embassy in Paris, a day after hundreds of people gathered outside the building to protest a film produced in the United States that insults the Prophet Muhammad.

Police officer Pierre Coric says more uniformed and plain clothes police have been put in place Sunday on the streets surrounding the embassy.

Coric said that 150 people were detained Saturday and had their ID's checked because the protest was unauthorized. One person remains in custody for roughing up an officer.

The demonstration was part of a wave of protests outside U.S. diplomatic posts around the world, some of which have turned violent. The U.S. Ambassador to Libya died in a protest in Benghazi, while protesters have also stormed the U.S. Embassy in Tunis.