KARACHI, Pakistan — Two huge blasts have rocked Pakistan’s Karachi airport which is under siege by militants, an AFP reporter at the scene said early Monday.

The militants are armed with guns and grenades, though the blasts are feared to be suicide bomb explosions.

Earlier, gunmen stormed the airport terminal used for VIPs and cargo in Pakistan’s largest city, killing at least five people and wounding another.

Mashhood Tajwar, a spokesman for the state-run Pakistan International Airlines, told Waqt News TV: “I can confirm that all the passengers are safe.”

Tajwar’s comments came as explosions were heard at Jinnah International Airport as authorities scrambled to secure the area.

Gunmen attacked the terminal late Sunday. Pakistani television stations aired footage of what appeared to be a major fire at the airport, with the silhouette of a jet seen.

A doctor at a local hospital said at least five people had been killed.