An incendiary device exploded outside the Athens offices of software giant Microsoft early on Monday.

Police said the device was made from two cooking gas canisters. The blast, which was not immediately claimed, caused damage to the building’s entrance. Nobody was injured.

Microsoft’s offices in Athens were attacked in June 2012, when a mini van packed with flammable materials was driven into the entrance and then fired upon by gunmen. That attack was claimed by the Informal Anarchist Federation-International Revolutionary Front (FAI-IRF).