KATHMANDU – Police near Mount Everest are investigating reports of a fight on the upper reaches of the world's highest mountain between two foreign climbers and their Nepalese guides, officials said Sunday.

"We were told our clients and the guides fought on their way to camp three. We don't have all the details yet, but our clients have come down off the peak," said Anish Gupta of Cho-Oyu Trekking, the Kathmandu-based company that organised the expedition.

He said that one of the clients, a Swiss national, had descended the mountain and was currently waiting for a flight back to Kathmandu.

The other client, an Italian, remained at Everest Base Camp and may still try to summit the 8,848-metre (29,029-foot) peak.

Sitaram Karki, the chief district officer in Solukhumbu, the region where Everest stands, told AFP the police were conducting an investigation, but the details were still unclear.

"There are communication issues high on the mountain, but we have received the reports of a fight and deployed our team to investigate the incident," Karki said.

More than 3,000 people have climbed Everest, which straddles Nepal and China, since it was first conquered by Edmund Hillary and Tenzing Norgay in 1953. Every year hundreds more set out in April to attempt the climb.