A Swiss couple have been kidnapped while travelling in southwestern Pakistan, a senior government official said on Friday, triggering a police search.

They were kidnapped in a district 170 kilometres (105 miles) east of Quetta, the capital of sparsely populated Baluchistan province, the official said.

"We have received reports that two Swiss nationals have been kidnapped in Loralai district," provincial home secretary ZafarullahBaloch told AFP, naming the area where the foreigners were taken.

"We have sent a team comprising police and an administration official to search them," he added.

Baloch said the Swiss citizens had entered Baluchistan from Dera Ghazi Khan district in Punjab province and might be coming to Quetta.

Nobody has yet claimed responsibility for the incident or contacted authorities about the kidnapped foreigners, he said.

Baluchistan, which borders Iran and Afghanistan, has seen an upswing in violence recently, with the province suffering from a separatist insurgency, sectarian violence and Taliban militants.

Hundreds of people have died since rebels rose up in 2004 demanding political autonomy and a greater share of profits from the region's natural oil, gas and mineral resources.