Two males had been arrested on suspicion of terrorism offences after police stopped a Fluctuate Rover in a metropolis centre.
The pair had been detained on Deansgate in Manchester following experiences of two males performing suspiciously on Chapel Road in Salford at 14: 30 GMT.
Suspicious objects had been came upon inside the auto and a precautionary cordon has been positioned round it, police stated.
The boys are being held on suspicion of the fee, preparation or instigation of acts of terrorism.
Officers stated they had been liaising with bomb disposal officers on the scene.
There might effectively be not any proof to counsel any chance to most people and detectives are sustaining an launch thoughts as to the character of the incident, Larger Manchester Police stated.
Deansgate is at the moment closed from Chester Road roundabout and diversions are in recount.