Was it a bomb?

The Associated Press reports that a video game arcade in Casablanca was rocked by an explosion which left at least one person dead this morning:

Hassan Sajeed says the explosion occurred at about 8:45 a.m. in front of or inside a video game arcade on his street, the Boulevard el Joulane.

Sajeed said he believed the explosion was a bomb, and that windows were blown out as far as 40 meters (yards) away.

However, an unnamed official at the Moroccan Interior Ministry said that the blast appeared to be caused by natural gas.

The AP notes that Casablanca experienced a series of deadly terrorist bombings in 2003.