A bill banning the promotion of homosexuality among children has passed its first reading in the Russian parliament.

If passed, it will mean that events promoting gay rights will be banned and the organisers fined.

Police made arrests outside the State Duma in Moscow after gay rights supporters planning a "kiss-in" were assaulted by opponents.

The bill faces two more readings in the State Duma, after which it must be approved by the upper house (Federation Council) and President Vladimir Putin before it can become law.