CREDIT: REUTERS/Stringer Anti-riot police block a street in the southern Yemeni town of Habileen April 3, 2008.

SANA'A, Yemen -- There have been two explosions close to the Canadian Nexen Inc. oil exploration building in the Yemeni capital of Sana'a, but no injuries have been reported, a company spokeswoman said Thursday.

"We are taking all the necessary precautions to keep our employees safe," Carla Yuill said. "We have moved a lot of our employees from the Sana'a office to some of our field operations."

Yuill said in an interview from Calgary that the explosions happened Wednesday and last Sunday. A third explosive device has also been found and disarmed. Yuill said she doesn't know yet whether the building was the intended target of the explosions.

"There have been some historical incidents of conflict that have gone on in Sana'a but, for our company, we've had relatively peaceful operations there," she said.  

Nexen started began oil exploration in Sana'a in 1988 and started producing oil there in 1993. The company operates the country's largest oil project and produced 71,600 barrels per day in 2007.