Chennai: Two persons are being questioned by police here on Tuesday for allegedly making a hoax bomb threat to the special aircraft of Prime Minister Manmohan Singh during his visit to Tamil Nadu.
  
The call was received by Pallavaram police station on the city outskirts around 1 pm on Monday stating that a bomb had been planted on the aircraft in which the Prime Minister was proceeding to Tiruchirappalli enroute to Karaikudi to attend two functions, police said.
  
Though the flight had already landed in Tiruchirapalli airport by the time the call came, searches were still carried out in the flight which proved the call to be a hoax, they said.
  
Tracing the call made from a mobile phone, police detained two persons from Poonamallee area here, for making the call.
  
"We have detained two persons and are conducting an inquiry. We have not arrested anyone yet," a senior police officer said.
  
They were questioning Ravichandran, on whose name the SIM card was made was purchased, and Jayakumar, who was actually using it, police said.
  
The Prime Minister was in Tamil Nadu on a two-day visit and returned to New Delhi from Tiruchirappalli on Monday morning.

(Agencies)