Pro-democracy lawmakers were dragged out of Hong Kong's legislature by security guards on Thursday after they heckled the city's pro-Beijing leader for a second day running, the latest outburst of political rancour in the strife-torn city.

Chief executive Carrie Lam has faced an outpouring of anger from her opponents since the legislature opened its doors for a new session on Wednesday, three months after the building was trashed by masked protesters.