BANGKOK, Thailand, Dec. 5 (UPI) -- An American-made M-72-A1 anti-tank rocket was fired into a building housing the Bangkok offices of Israeli airline El Al on Wednesday, but no one was injured, Thai police said.

A police spokesman said the rocket was fired from a launcher on the street outside the Monorom Building on Bangkok's Rama IV Road at about 4 a.m. local time and smashed into a fourth floor parking garage.

The blast caused some minor damage to a wall around the garage and shattered nearby windows, but there were no people in the area at the time and no one was hurt.

Police arrived at the scene about two hours later and found the launcher in a trash can outside the building.

The Bangkok headquarters of El Al is on the 14th floor of the building, and police said they were investigating a possible connection.

Israel's embassy in Bangkok has been the target of at least two terrorist attacks.

However, police said it was likely Wednesday's rocket attack was related to a local business dispute.

A high-ranking police source said he believed the attack was intended as a warning in a long-time dispute between rival private security companies hired to protect the British-owned Tesco Lotus

superstore, which is adjacent to the Monorom Building.

Thai army soldiers employed by the security companies have been accused of carrying out a series of bombings and other violence this

year. War weapons are easily available on the black market.

The army's Inspector General's Department is currently moving to discharge one officer, Col. Chamnan Masamrant, who was implicated in the bombing last June of another Tesco Lotus superstore branch in Samut Prakan, south of Bangkok.