WARANGAL: Five ISI activists were killed in police firing near Aleru town on Hyderabad-Warangal national highway 163 in Nalgonda district on Tuesday morning The police opened fire when the ISI activists attacked them in a bid to escape.A police team was escorting ISI activist Vicaruddin and four others in a van from Warangal jail to Hyderabad for production in a court when the incident took place.Police said the ISI activists attacked the escort party and snatched their guns forcing the other security guards to open fire. All the five died on the spot.The police beefed up security all over Telangana following the incident. Police pickets were set up in Hyderabad and people are being frisked.The dead have been identified as Vicaruddin, Syed Amjad, M Hanif, M Zakir and Azhar Khan. Vicaruddin had been facing several charges including the attack on a police party at Santoshnagar area of Hyderabad in 2009.He was also associated with the banned terror group SIMI . The firing took place at an isolated place about three km away from Aleru town.Police said the Vicaruddin and others attacked the escort guards and opened the vehicle door.They also attempted to fire at the security personnel, Aleru police said.This is the third incident of firing in the backward Nalgonda district in the last six days.Three policemen and two SIMI activists were killed in separate incidents of exchange of fire in Nalgonda district earlier this week.Meanwhile, an NIA team held a review meeting with senior police officials in the office of Suryapet DSP. They took details about the recent incidents of exchange of fire including Tuesday's police firing.