Gunmen abducted two Pakistani Christians working for a South Korean-run hospital in Karachi on Wednesday.
Four armed men stopped a car taking the employees to work in the western neighbourhood of Orangi, local police station chief Sabir Khan said.
"They asked the occupants: 'Who is Korean among you?' They replied 'none of us'," the police officer said.
"However they snatched two hospital employees - a computer operator and an administration assistant. Both are members of the Pakistani Christian community, and fled in a car," he said.
No foreigners were in the vehicle that was stopped, Khan said.
"We have sent teams to track down the kidnappers and recover the staff members," he added.
The hospital is run by a South Korean charity, Khan said. Korean doctors work at the hospital and live in the premises, the policeman said.
Armed men kidnapped two staff members of a hospital of Orangi Town while they were on their way to join duty here Wednesday morning.
Police said the kidnapping might be for ransom as incidents of kidnapping for ransom are on the increase in the city.
Meanwhile, the Docks police rescued a trader after an encounter. One kidnapper was arrested in injured condition while his three accomplices managed to flee.
CPLC chief Ahmed Chinnoy said that businessman Muhammad Yousuf was kidnapped from Tariq Road along with his car and kidnappers demanded ransom to free Yousuf. When the kidnappers were called for ransom payment, they opened fire on police who were present on the spot.
In retaliation, police also exchanged fire with the kidnappers that injured one while three others escaped from the scene. Police arrested the injured hostage taker.
Three motorcycles and a mobile phone of the kidnappers were also taken into custody.