KABUL, Afghanistan (CNN) -- Gunmen kidnapped a French aid worker in Kabul Monday and shot dead an Afghan intelligence official who tried to rescue him, police said.
Aid worker Gayle Williams was shot dead by the Taliban in Kabul last month.
A second foreigner escaped unharmed.
A senior Afghan police official said two foreigners were walking in a residential area of the capital city Monday when three armed men drove up in a car.
They dragged the French aid worker into the vehicle. But as they were trying to drag the second man in, an intelligence official driving by intervened, the police official said.
The gunmen fatally shot the intelligence official and took off with the French worker.
Interior Ministry spokesman Zemarai Bashary confirmed that militants had kidnapped a Westerner, and said a massive police search was underway.
An organization that monitors the safety of non-governmental agencies in Afghanistan also confirmed the account.
The French aid worker has not been identified.
Dozens of aid groups are in Afghanistan helping to rebuild the war-torn country. But many of them have been forced to scale back relief work because of attacks on their workers.
Last month, gunmen on a motorbike fatally shot a foreign dual British-South African national who was on her way to work in Kabul.
The Taliban claimed responsibility for the death of Gayle Williams, 34, saying on its Web site that it killed the "foreign woman" for preaching Christianity in the country.
In August, a Japanese aid worker, Kazuya Ito, 31, was found dead after assailants abducted him in east-central Afghanistan.
And in a separate incident the same month, gunmen fired on a vehicle belonging to the New York-based International Rescue Committee. Four aid workers died in that attack.
Journalist Farhad Peikar contributed to this report