Hong Kong night of violence: Dozens injured as anti-government protesters attacked by triad gangsters

* Triad gang attacks anti-government protesters-lawmaker * Hong Kong police defend lack of arrests * Forty five people injured in triad attack * Police fire rubber bullets at protesters, 13 injured

An anti-extradition demonstrator runs away from tear gas, after a march to call for democratic reforms, in Hong Kong REUTERS/Tyrone Siu

Donny Kwok and Vimvam Tong

Hong Kong police on Monday defended their actions and the lack of arrests after opposition lawmakers said police had failed to protect a train full of anti-government protesters from a triad gangster attack on Sunday.