Union Home Ministry sources in Delhi said it was a terror strike in which militants had used a low-intensity improvised explosive device.
They said the terror outfits, including Pakistan-based Lashkar-e-Tayiba, were against Sufi Islam and they could be prime suspects behind the blast at the shrine, respected by both Hindus and Muslims, which came barely 10 days ahead of the meeting of Indo-Pakistan anti-terror mechanism on October 22.
Central Reserve Police Force battalions based in Ajmer had been kept in readiness for deployment at the shrine.
Rajasthan Principal Secretary (Home) V S Singh said it was a low-intensity blast and a team of forensic experts have reached the blast site.
Entry into the dargah, visited by both Hindus and Muslims, has been restricted and people are being screened, he said.
Rajasthan Chief Minister Vasundhara Raje, who is in Delhi, announced a compensation of Rs 5 lakh for the next of kin of those killed in the terror attack at the shrine of Sufi saint Khwaja Moinuddin Chisti. The seriously injured will get a relief of Rs 1 lakh each.
Image: Paramilitary personnel and policemen outside the dargah on Thursday.
Photograph: STRDEL/AFP/Getty Images
Also read: Graphic on Ajmer blast