ATHENS — A guerrilla organization known for targeting political and foreign diplomatic sites in Greece has claimed responsibility for a gun attack on the Israeli Embassy in December, a Greek police official said on Wednesday.

In the assault on Dec. 12, gunmen with Kalashnikov rifles opened fire on the Israeli Embassy in a northern suburb of Athens, raking the building with bullets but causing no injuries.

An organization called Group of Popular Rebels claimed responsibility for the attack, according to the police official, who spoke on condition of anonymity, as is customary for the police in Greece. Counterterrorism officers are examining a 19-page statement found on a portable digital storage device left in a trash bin in the southern Athens suburb of Nea Smyrni, he said. The police were alerted in the early hours of Wednesday by staff at a left-leaning newspaper, who received an anonymous call informing them of the location of the device.

Police tests on bullet casings found outside the Israeli Embassy after the attack showed the shots were fired from two assault rifles used in a similar attack in December 2013 on the German ambassador’s home, also in the capital’s affluent northern suburbs.