HONG KONG (AP) — Protesters in Hong Kong have snarled the morning rush hour by blocking train and platform doors to prevent trains from leaving stations.

Subway and train operator MTR said Monday that service had been partially suspended on four lines because of a number of door obstruction incidents.

It's the third time in three weeks that protesters have disrupted train service. The action followed a weekend of clashes with police on the streets and ahead of a general strike and more demonstrations called for Monday afternoon.

Hong Kong has seen protests all summer. A movement against an extradition bill that would have allowed residents to be sent to mainland China to stand trial has expanded into demands for an investigation into alleged police abuse at protests and the dissolution of the legislature.