(CNN) A search is underway for seven climbers -- four Britons, two Americans and an Australian -- and their Indian liaison officer, who went missing a week ago during an expedition in the Indian Himalayas, local authorities say.

The group was attempting to scale Nanda Devi East, one of the highest and most difficult to climb peaks in India at just over 24,000 feet (7,400 meters) tall, local Uttarakhand District Magistrate, Vijay Kumar Jogdande, told CNN.

The missing eight were part of a larger team of 12 who set off from the village of Munsiyari on May 13. But 12 days later, on May 25, only four of the group returned to base camp, said Uttarakhand's Senior District Official, R.D. Paliwal.

The entire group was supposed to reach its base camp on May 26, according to Jogdande. The base camp is located at 19,685 feet (6,000 meters) above sea level.

The company which arranged the expedition, Himalayan Run & Trek, waited a few days after the remaining members of the team failed to arrive before alerting authorities of their disappearance on May 31, Jogdande said.

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