"Glitches in the signalling and communication system" delayed RapidKL LRT trains between the Ampang Park and Dang Wangi stations early today, forcing many commuters to be held up at several stations.

The glitches forced RapidKL to "power down the line" at several stations in the city centre to attend to the situation that occurred at about 7am, said Kelana Jaya LRT Line chief operating officer Ismail Abdullah.

"Trains on the Kelana Jaya Line were shuttling between Putra Heights and Dang Wangi and between Gombak and Ampang Park.

"Buses were deployed to ferry commuters in need of alternate travel services from the Sri Rampai LRT station to the city centre and between KLCC and the city centre," he said in a statement.

Ismail said repairs were underway to restore the service between Ampang Park and Dang Wangi.

"We wish to extend our sincere apologies to our commuters whose travel was interrupted by the glitches," he said.

Commuters who had entered the paid area of the stations could seek a refund from the customer service offices, he said.

A RapidKL LRT spokesman said the problem occurred at about 7am and the technical team was still attending to the matter at noon.