More than 100 people were arrested during a protest by cyclists during the Olympics opening ceremony, police said today.

Scotland Yard said two groups of protesters were arrested on suspicion of breaching protest conditions and causing a public nuisance.

The amateur cycling club had tried to pedal their way through the security cordon around the Olympic Park during yesterday evening's opening ceremony.

Officers scuffled with several pro-cycling activists as dozens of cyclists were blocked by police vans from proceeding, Scotland Yard said. No serious injuries were reported.

The cyclists were identified as members of a monthly cycling event called "Critical Mass" that normally passes through the area, but a police order had prohibited the group from traveling into the Olympic Park area in east London during last night's opening ceremony.

Police said they would give the precise number of arrests later.

Separately, a small radical Islam group had planned a demonstration outside the Olympic Park to expose what it calls "the evil of the Olympics" yesterday, but the protest was canceled for no stated reason last week.