Microsoft’s Greek branch has issued a brief statement saying that it is relieve there were no injuries when armed assailants set fire to its offices in Athens early on Wednesday.

The company said that it would wait for the results of a police investigation into the incident, which led to serious damage to the ground floor of the building and some damage to the first floor.

“Our priority is our people and we are grateful that there were no injuries and all the employees are safe,” the firm said in a statement.

Authorities said three armed men threatened the night guard and drove a stolen truck through the entrance. They then poured a flammable liquid on the floor and set fire to it.

The vehicle was also burned in the fire. Police found containers of flammable liquid and camping gas canisters in the truck.

The investigation into the incident is being handled by Greece’s anti-terrorism squad.

Microsoft’s office, which is located in the northern suburb of Maroussi and were more than 100 people work, will be closed on Wednesday.