Officials of the Archaeological Survey of India (ASI) had found the grenade during a cleaning operation last evening. The discovery of the explosive in the 17th century monument visited by hundreds of tourists and locals led to panic in the area.
A cordon was thrown around the area and the NSG was called in after ASI officials alerted the police and the Central Industrial Security Force (CISF), said a senior police official.
"The grenade was safely removed today by the NSG. How old it is can only be ascertained once a detailed report is received from the NSG," said DCP (North) Jatin Narwal.
The incident comes just a few months after a similar incident in February when explosives and live cartridges were found in a well in the complex during a cleaning exercise.