The military used heavy weapons and helicopter gunships to repulse the attack.

BBC: Afghan militants ambush Pakistan troops in Upper Dir

Boeing was chosen as the preferred vendor for the heavy-lift helicopter contract after its bid was found to be lowest of two competing companies.

WSJ: India, Boeing in Talks for Helicopter Deals

Israeli and Egyptian authorities coordinated to allow the helicopter gunships and heavy machinery into the demilitarized zone in accord with the Camp David agreement signed in 1979.

CNN: STORY HIGHLIGHTS

The operator should use an independent risk evaluator for weather and other environmental conditions like volcanic ash or even heavy pollutants which can effect helicopter operation and pilot visibility.

FORBES: 10 Essential Checks Before You Step Into A Helicopter

Second, Clinton described a trip to Bosnia as first lady when, she said, her helicopter was forced into a heavy landing under sniper fire and she was forced to run for cover.

CNN: Obama wins tight Democratic race

Officers armed with machine-guns and wearing balaclavas broke down a heavy wooden front gate and abseiled from a helicopter to gain entry to the property, media reports say.

BBC: German police target Hells Angels in large-scale raids

He added that when the helicopter arrived back at Camp Bastion, the troops had to endure a "heavy landing" before they could alight, though he said they had no idea the helicopter was badly damaged.

BBC: Flt Lt Christopher Gordon

The company also expects the Indian government to shortly invite bids for six heavy-lift transport helicopters, for which it will pitch the Chinook helicopter, Mr. Lall said.

WSJ: Boeing Expects India to Buy Military Products Worth $31 Billion

The BBC's Mamadou Moussa Ba in Gao says heavy bombardment could be heard in the centre of the city on Tuesday, with a French helicopter patrolling.

BBC: France action in Mali is real war, says Le Drian