TransCanada Says Leak on Alberta Natural Gas Pipeline Shut In

CALGARY, May 12 (Reuters) - A natural gas leak on a section of a TransCanada Corp pipeline near Medicine Hat, Alberta, has been safely shut in, TransCanada said on Tuesday.

Spokesman Davis Sheremata said the cause of the leak on the Suffield Lateral line was not yet known, and the company did not have details about how much gas had been released.

A spokeswoman for Canada's Transportation Safety Board confirmed the leak had been isolated and that an investigator was expected on the scene later this afternoon.

A drop in natural gas pressure on the line was first detected late on Monday. The leak occurred in a rural area.

Sheremata said TransCanada was not yet sure what the impact on gas deliveries to customers would be.

(Reporting by Nia Williams in Calgary and Julie Gordon in Vancouver; Editing by Chris Reese and Phil Berlowitz)