The Ministry of Foreign Affairs said the Police and CID were investigating the incident in which local Swiss embassy employee was allegedly abducted, detained and questioned by unknown entities.
The government statement followed a request by the Swiss Embassy for immediate and impartial inquiry into incident.
The Swiss Ambassador to Sri Lanka paid a courtesy to the newly-appointed Foreign Affairs Minister Dinesh Gunawardena yesterday and requested a speedy inquiry.
It is learnt that the Ambassador has been summoned by his government to seek further information on the matter.