Riot police returned to Hong Kong’s MTR stations on Monday to chase down anti-government protesters, who disrupted train services on a couple of the city’s routes after clashes over the weekend.At Lai King station during the rush hour, three officers dressed in riot gear entered a train carriage to arrest several protesters, and pushed them out onto the platform. There were some 40 riot police at the station.Security at stations was markedly heavier across the city, with police patrolling in…