A man was arrested after a bottle was thrown onto the track at the start of the men's 100m final at the Olympic Stadium on Sunday, police said.
The man shouted abuse then threw the bottle just before the showpiece final got under way, a Scotland Yard spokesman said.
"A man was arrested inside the Olympic Stadium. The offence was on suspicion of causing a public nuisance," the spokesman said.
"He had been heard to shout abuse and then threw a plastic bottle on to the track.
"That was immediately prior to the start of the men's 100m final. He remains in custody at an east London police station."