KARACHI, PAKISTAN, SEPT. 23 -- A Pakistani journalist was stabbed today after he received at least a dozen threatening telephone calls warning him against continuing to write stories on government corruption.

Kamran Khan, who works for the Independent News here, was reported in satisfactory condition in a local hospital with arm and shoulder wounds, police and medical officials said. The threatening calls began almost two weeks ago after Khan wrote an article alleging police in Pakistan's southern Sindh province were engaging in abuses ranging from extortion to illegal confinement.

Khan also is a stringer for The Washington Post. Associates said he had written Prime Minister Nawaz Sharif reporting the threats and demanding protection.

{In a letter to the prime minister, Executive Editor Leonard Downie Jr. of The Washington Post expressed concern for the safety of Khan and his family, asked for their protection and called for a vigorous investigation of the matter.}

A spokesman for the prime minister's office, who could not be identified under usual briefing rules, condemned the attack, but said he had heard nothing of the threats against Khan. "Our government would provide protection to all people, especially journalists," said the minister of law and parliamentary affairs, Muzzafar Shah.

Police said assailants on a motorcycle intercepted Khan in Karachi and stabbed him in the arm and shoulder.

Over the weekend, the Karachi Union of Journalists accused the government of harassing journalists. Several working in Karachi have been either attacked or threatened by government officials or people reportedly tied to the provincial government.

For several years, Pakistan's troubled Sindh Province has been wracked by ethnic and political violence. More than 1,000 people have been killed.

Washington Post correspondent Steve Coll added from New Delhi:

Khan has been threatened frequently. One series of telephone threats followed a Washington Post story to which he contributed about Asif Zardari, the husband of former prime minister Benazir Bhutto.

Since then, the government has changed but Khan has continued to publish investigative stories about government corruption, and has periodically received threats under the new government.