Hong Kong's subway system has closed early for more than a week, effectively cutting off the main mode of transportation for millions of residents. Many are now wondering how long it will last.

Following unprecedented vandalism on the night of Oct. 4, when Chief Executive Carrie Lam banned face masks after invoking emergency powers last used in 1967, many stations were left in tatters. The rail operator MTR Corp. shut the entire network for a whole day for the first time since 2007 before gradually reopening damaged stations.

The MTR has said it needs extra time to repair its stations. But as the service keeps getting curtailed, protesters have accused the company of helping the authorities prevent further demonstrations. In recent statements, the MTR has cited a "joint risk assessment with other relevant government departments" as a reason for the closures.