Egypt's Muslim Brotherhood condemned a bomb attack on a security compound in the Nile Delta town of Daqahliya which killed 12 people and wounded more than 134 early on Tuesday.
"The Muslim Brotherhood condemns in the strongest possible terms the attack on the police headquarters in Mansoura (region)," an emailed statement from the group's London press office said.
"The Muslim Brotherhood considers this act as a direct attack on the unity of the Egyptian people and demands an enquiry forthwith so that the perpetrators of this crime may be brought to justice."
Cabinet spokesman Sherief Shawki had blamed the blast on the movement of ousted Islamist President Mohamed Morsi.
Shortly after the bombing, prime minister Hazem Beblawi labelled the Brotherhood a "terrorist" group, though he stopped short of blaming it for the attack.
“Whoever is behind this act is a terrorist and will be brought to justice and punished according to the law. But I don’t want to anticipate the incidents," Prime Minister Hazem El-Beblawi had said.