ISLAMABAD, Sept 28 (Reuters) - Gunmen kidnapped a Polish engineer in Pakistan on Sunday after shooting dead his Pakistani driver, body guard and translator, a senior police official said.

The engineer is an employee of the Polish oil company Geofizyka Krakow, the Polish Foreign Ministry said, and was visiting one of the company's sites near Attock city, about 65 km (40 miles) west of the capital, Islamabad.

"The criminals came in white car at around 6:45 a.m. (0045 GMT) and first they killed his Pakistani assistants and then whisked him away to an unknown place," said police officer Kazim Ali.

Ali said it was not known if the kidnappers were criminals or Islamist militants.

Kidnap for ransom is relatively common in Pakistan though foreigners are not often targets.

Militants also occasionally take foreigners hostage.

Two Chinese telecommunications engineers were kidnapped in the northwest in late August and a spokesman for Pakistani Taliban said the militants were holding the pair.

Afghanistan's top diplomat in Pakistan, ambassador-designate Abdul Khaliq Farahi, was kidnapped this month in the northwestern city of Peshawar after gunmen ambushed his vehicle and killed his driver.

No one has claimed responsibility and Afghanistan on Sunday urged Pakistan to do more to find him.

"Afghanistan emphasises that Pakistan's security authorities ... should behave with sincerity and seriousness," Afghan Foreign Minister Rangeen Dadfar Spanta told a news conference in Kabul.

Spanta did not elaborate but said the Afghan government had not received a ransom demand. (Reporting by Kamran Haider and Sayed Salahuddin in Kabul; Editing by Robert Birsel)

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