Protesters in Hong Kong have disrupted subway service during the morning commute by blocking the doors on trains, preventing them from leaving the stations. Picture: Vincent Yu/AP

Hong Kong — Angry Hong Kong commuters argued with protesters who blocked the doors on trains Tuesday morning, preventing them from leaving stations.

Service was delayed and partially suspended on the Island and Kwun Tong lines, subway operator MTR said. It cited "a number of train door obstructions" as well as someone activating a safety device at a platform on the Kwun Tong line.

AP video showed heated exchanges at Tiu Keng Leng station, where a crowd of protesters and commuters filled the platform and a stopped train.

The disruption is part of a pro-democracy movement that has seen hundreds of thousands take to the streets this summer for marches and rallies. The protests have shaken the government in Hong Kong and raised concern in Beijing. The city is part of China but has a fair degree of autonomy in local affairs.

Protesters block train car doors in Hong Kong. Picture: Vincent Yu/AP

Posts on Twitter showed long lines of commuters waiting for free shuttle buses provided by MTR to other subway stops.

Protesters wearing masks occupy a train car at a subway station in Hong Kong. Picture: Vincent Yu/AP

Protesters conducted a similar action to block trains last week.

Police restrain an angry passenger who tried to fight with protesters in Hong Kong. Picture: Vincent Yu/AP