An al-Qaida-inspired group based in Egypt's Sinai says it was behind Tuesday's car bombing of a police headquarters in the Nile Delta city of Mansoura - an attack that killed at least 15 people.
In a statement Wednesday, Ansar Beit al-Maqdis said the attack was carried out by a suicide bomber it identified as "Abu Maryam."
The group said it was responding to the government's crackdown against Islamists.
The bombing was the one of the deadliest attacks against Egyptian security forces since Egypt's military ousted an elected Islamist president, Mohamed Morsi, in early July.
Ansar Beit al-Maqdis has previously asserted responsibility for bombings in Sinai and the attempted assassination of Interior Minister Mohamed Ibrahim in Cairo in September.