Assailants attacked the offices of Microsoft in Athens, driving a van through the front doors and setting off an incendiary device that burned the building entrance, police said.

 There were no reports of injuries in the pre-dawn attack on the U.S. company's headquarters in the Greek capital, located in the Maroussi suburb north of the city center.

There was no immediate claim of responsibility, says a Fox News report. Authorities said no warning call had been made before the attack.

The report said that three people had been inside the van. They forced the two security guards at the building to leave before they reversed the van into the front entrance, smashing the door.

The assailants then triggered an incendiary device inside the van that police said appeared to have consisted of camping gas canisters and several containers of gasoline, the report says.