He received the letter by post yesterday written in Urdu and English, he claimed at a press conference here.
He, however, refused to give a copy of the letter saying he has handed it over to Abids police station.
In the letter, the LeT stated that its next target is Begam Bazar, Reddy claimed.
Begum Bazar is another crowded wholesale market in the city.
When contacted, Abids police said, "We have received a letter from Kishan Reddy today and it is being verified.