Kabul, Afghanistan (CNN) -- A group of Taliban insurgents launched an apparently unsuccessful attack on a major NATO base in Afghanistan Tuesday, according to international forces.
The insurgents used suicide bombers and ground weapons in their attempt to breach the perimeter of Kandahar airfield in southern Afghanistan, said Maj. Michael Johnson, spokesman for NATO's International Security Assistance Force (ISAF).
Another coalition source told CNN that a suicide bomber at the gate blew himself up.
Fazel Ahmad Shirzad, the security director of Kandahar police, said six Taliban insurgents, including two suicide bombers, attacked the airfield at midnight. One of the suicide bombers drove a tractor in an attempted attack on a security tower; another fired light and heavy weapons.
Six insurgents were killed and two civilians and an ISAF soldier were slightly injured, Shirzad said.
CNN's Barbara Starr and Atia Abawi and journalist Matilullah Mati contributed to this report.