[1] During his sermon, the Salafist Moussa condemned the nationalist-Islamist Hamas for failing to implement proper Sharia law and "not being any different from a Secular government".

Exchanges of gunfire erupted into a seven-hour battle in which Hamas fighters sealed off the entire neighbourhood and fired rocket-propelled grenades at the mosque.

An Egyptian National Security Agency official said a three-year-old boy from Egypt, across the Egypt–Gaza border, was critically wounded by a bullet which reached him from the fighting in Gaza.

The video showed Hamas militants gathering several Jund Ansar Allah fighters in the courtyard of the Mosque, and then mowing them down in a fierce burst of gunfire.

Jund Ansar al-Jihad wal Sunna, a previously unknown group, claimed responsibility for the attack, declaring: "We urge our jihadist brothers to join forces to conduct painful joint warfare against those miscreant murtadeen [Hamas] and end their reign."

Associated Press said that "the two explosions appear[ed] to be revenge attacks against Gaza's Hamas rulers," and suggested a link with Jund Ansar Allah.