CAIRO (AP) — An al-Qaida inspired group in Egypt posted a video online Thursday showing a suicide bomber attacking a security headquarters in the Nile Delta city of Mansoura, an assault that killed 16 people in December.

The video by Ansar Beit al-Maqdis, or the Champions of Jerusalem, also said the suicide bomber previously was injured in Islamist demonstrations against the ouster of Islamist President Mohammed Morsi by Egypt’s military. The comment marks the first time a suicide bomber in the widening campaign of militant attacks striking Egypt has been directly linked to demonstrating Morsi supporters.