UP Police and ATS will question four people who have been detained in connection with Saturday's blast at a hospital in Agra.
At least four people were injured in a low-intensity explosion on Saturday at a private hospital, less than three km from the Taj Mahal, police said.
"Four people were injured in the blast at the hospital," Deputy Inspector General of Police, Agra Range, Assem Arun said.
The explosion took place around 5.30 pm at the reception of Jai Hospital, situated on a service lane of National Highway-2, barely 2.5 km away from Taj Mahal, a declared terror target and frequented by thousands of tourists, Indian and foreigners.
Security at the Taj Mahal and other places was increased in the city after the explosion.