ISLAMABAD - Pakistan Army's rescue teams Monday resumed search for three missing Iranian climbers during the expedition to climb the world's 12th highest peak Broad Peak, officials said.

The Iranian climbers went missing five days ago at about 7,800 metres while descending from the Broad Peak after conquering it.

According to sources, nine climbers from different countries scaled the peak and began descending. Six of them reached the base camp.

The ill-fated mountaineering team departed from Skardu on June 20 in a bid to reach the top of the Broad Peak.

A tourism official in the region, Sadia Danish, said that the Pakistan Army has launched a search operation to rescue the stranded climber.

Unofficial search was started on July 16 when the team had gone missing, she said. The Iranian climbers are thought to have strayed the traditional route and were stranded while descending the peak.

The Iranian embassy in Islamabad is also in touch with the Pakistani authorities.

With a height of 8,051 metres, the Broad Peak, also known as K3, is the 12th highest mountain in the world. It is located on the Pak-China border and in the Karakoram mountain range about 8km from K2.

The head of a mountaineering club in Islamabad Manzoor Hussain, said the three Iranians successfully ascended the summit, adding, the men sent a call for help while descending the peak, saying they were exhausted and had run out of food.