Hundreds of Muslims on Thursday marched towards the American Centre here to protest against an anti-Islam video and to demand that the US authorities apologise for it.

The protestors, belonging to Muslim organisations, including the All-Bengal Minorities Youth Federation, broke barricades and tried to approach the highly-fortified American Centre on Chowringee, but were stopped some distance away, police sources said.

The protest grid-locked traffic bumper-to-bumper on Chowringhee and C. R. Avenue in central Kolkata and had a ripple effect elsewhere, including the south and the north in the metropolis.