The five passengers travelling in the bus were safe, police said today.
The accident took place at Amritsar-Loharka bypass, about 30-km away from Attari-Wagah border, when it was coming from Nankana Sahib in Lahore and heading towards Amritsar International Bus stand.
According to police, the pilot vehicle which was moving ahead of the bus collided with an SUV, as a result of which the bus travelling behind, hit the pilot vehicle. Unable to control, the escort vehicle following the bus rammed into it.
After the accident, the bus restarted its journey with Punjab police providing pilot and escort vehicles.
Former Prime Minister Manmohan Singh had flagged off the bus service between Amritsar and Nankana Sahib, the birth place of founder of Sikh religion Guru Nanak Dev, in March 2006.