Large-scale animal sacrifices marking the Islamic festival of Eid al-Adha combined with heavy rains have turned the streets of Bangladesh's capital into rivers of blood.

Security officials were searching for clues and criminal masterminds who might have set in motion the bloody hostage crisis that left 28 dead, including six attackers and 20 of the hostages, in the diplomatic zone of the Bangladeshi capital Dhaka.

A baby girl has been born with two heads in a hospital in Bangladesh.