KUALA LUMPUR, July 4 -- The Kuala Lumpur International Airport (KLIA) Aerotrain service was temporarily suspended this morning after water accumulated in its tunnel following heavy rainfall.

Malaysia Airports Holdings Bhd (MAHB) said the incident occurred at around 11am when one of the tunnel's drainage pumps experienced a technical fault during severe weather.

"The tunnel's drainage system includes pumps designed to handle water ingress during heavy rain. However, one of the drainage pumps failed to activate automatically, which led to water building up in the tunnel," MAHB said in a statement here.

It said train operations were halted as a safety precaution, and technical teams were deployed to manually clear the water from the track...