According to the police, a call was received at around 8.50 am that six terrorists could come under the garb of lawyers and carry out a shooting spree at the Tees Hazari complex.
Police has cordoned off the entire area while staff, litigants and lawyers have been asked to call it a day in view of the threat.
A police official said the anonymous caller had said that the terrorists in the attire of advocates will carry out indiscriminate firing between 10 am and 2 pm at the court complex.
Police teams, which included bomb disposal experts and sniffer dogs, are sanitising each and every room to ensure that no terrorists is holed up there, the official said, adding that a search for explosives is also been carried out.
"We are trying to trace the caller," the official said, maintaining that it could be a hoax call "though we are not leaving anything to chance and sanitising the entire area."