ISLAMABAD, Pakistan, July 7 — An Afghan member of Parliament accused the American-led coalition of opening fire on his family as they traveled by car in one of the most troubled provinces of southern Afghanistan, killing his brother-in-law and wounding five others, including his wife and two of his children.

Haji Abdul Khaliq, a legislator from Uruzgan province, said in a telephone interview that the shooting occurred on Wednesday and that American and Australian troops were responsible for it.

"My wife, my son, my daughter, my nephew and my wife's brother were traveling with a driver from Uruzgan to Kandahar for medical checkup at Kandahar hospital when they were attacked by American and Australian troops from the top of a hill," he said. It was the middle of the afternoon, he added.

"The coalition were on the top of the hill and start shooting toward their car, killing my wife's brother, Abdul Baqi, and injuring my wife, my son, my daughter and my nephew." His nephew and the driver were slightly injured, Mr. Abdul Khaliq said.

The family took cover in a ditch beside the road and lay on the ground for several hours, he said. The coalition kept firing on the car and after some time came to the scene, he said, but even when they saw the woman and children lying wounded they did nothing to assist them.

"They did not help them or even give them a bottle of water," he said.

A statement from the American-led coalition said it was "deeply saddened" by the reports, but added that "coalition forces are confident the coalition is not responsible for this attack."

Lt. Col. Paul Fitzpatrick, a coalition spokesman, said that there had been only one report of coalition forces "engaging the enemy" in the region, and that it took place at night when "four Taliban extremists on foot" fought a patrol "far off the road."

Colonel Fitzpatrick added that the claim that coalition forces were responsible for the attack on Mr. Abdul Khaliq's family "could very well be extremist propaganda."A few hours after the attack, Mr. Abdul Khaliq said, villagers and friends of the family came to help them and took them to hospital in Tirin Kot, the provincial capital of Uruzgan, 111 miles away. He moved the family to Kandahar hospital Thursday, he said.

"I am very sad and disappointed about this because the coalition is always saying that they are here to help the Afghans and they respect the rights, but first they shot women, and then when they came upon them they did not care to take them to hospital or treat them," he said.

"Even if this happens to the enemy of Afghanistan, they should take the injured to the hospital," Mr. Abdul Khaliq said. "They just left them in the desert and under the strong sun."

Coalition forces come under fire or ambush almost daily in southern Afghanistan and in a separate incident the coalition reported one soldier was killed and one wounded in an ambush Wednesday in the next province door, Helmand.