A Norwegian human rights group says two of its British employees have gone missing in Qatar while researching migrant worker issues in the Gulf nation that is due to host the 2022 World Cup.

The Global Network for Rights and Development said Thursday that researcher Krishna Upadhyaya and photographer Ghimire Gundev were supposed to leave Qatar on Sunday, and that their fate is unknown.

The group earlier said the pair arrived in the Qatari capital of Doha on August 27 and disappeared after allegedly being harassed by police.

A British Embassy official speaking on condition of anonymity in line with government policy said the mission is aware of reports that two British nationals have been detained and is investigating the matter.

Qatari officials could not immediately be reached for comment.