Rendering of the new consulate compound. Construction began June, 2010.

A series of grenade explosions went off near the U.S. consulate in Monterrey, Mexico, Friday evening. The closest explosion was just 44 yards from the consulate, according to employees. At least three grenades exploded in the area over the course of an hour, beginning about 8 p.m.

No Americans were injured, and U.S. property was undamaged from the explosions. Some cars in the area were damaged by the blasts. A nearby watchman was reported to be injured by shrapnel, according to El Norte, the local newspaper.

Justin Davis, a consulate duty officer, said it is not thought that the attacks were targeted against the consulate, but the office is concerned about how close the blasts were. The consulate currently has 54 American citizens on its staff, and 98 Mexican employees.

The consulate had no plans to close due to the attacks, but is prepared for any situation that might arise, Davis said. U.S and Mexican officials are investigating the incident.

The U.S. Consulate in Monterrey is one of the busiest and largest U.S. consulates in the world. It serves approximately 85,000 U.S citizens that live within its district. The consulate currently occupies a building that has been leased by the U.S. since 1969. Construction of a new consulate, designed for up to 200 staff and with improved security features, began in June, 2010.