In a new twist to the probe into the recent air crash in Pakistan which killed the Air Chief and top Pakistan Air Force (PAF) officers, it is now learnt that the pilot was changed at the last moment and villagers near the crash site had heard gunshots and found a Kalashnikov and bullets nearby, diplomatic sources said today.The inquiry committee has found the pilot was changed barely 20-25 minutes before take-off, they said. Sources said Mir, who was handpicked by Gen Pervez Musharraf after superseding at least six PAF officers, had developed differences with the President over the granting of air base and facilities to FBI in connection with the raids against Al-Qaeda.