BANGKOK (AP) — Morning rush-hour commuting was disrupted in Bangkok on Tuesday when the city’s popular elevated mass transit system experienced what its operators said was its first major system-wide failure in 14 years of operation.

The Bangkok Mass Transit System, operators of what is popularly called the skytrain, said the stoppage was caused by a failure in the computerized traffic control system.

The operator said service was restored after about five hours. The skytrain usually opens about 6 a.m. and shuts down at midnight.

The skytrain and a subway system are popular in Bangkok, where traffic jams are common.