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Mr. Hart identified the owner of the tractor-trailer as Webster Trucking Co. of Connecticut and Massachusetts and said it was cooperating.

He said officials were bringing in extra equipment to inspect the left front side of the bus to check the driver’s account.

State police have identified all but two of the victims. Officials said most were of Chinese descent.

Sai Ling, 57, lost her parents, Kam and Yuk Ng, in the crash. She said her father, a former cook, had gone to the casinos for many years, but her mother, a retired garment worker, had begun to accompany him in the past few months after her sister died.

“He didn’t want to see her crying every day,” Ms. Ling said.

Ms. Ling said her parents had lived in the United States for 30 years and left seven grandchildren.

“This bus driver took their lives,” she said. “They were in good health. They expected to live another 10 years.”

The casino has a lounge for bus drivers with coffee, soda, snacks and televisions, Mohegan Sun President Jeff Hartmann said. He said he did not know whether Mr. Williams was in the lounge before the trip.

“We don’t keep track of them. They’re on their own,” he told the AP.

He said the casino was cooperating with police.

The bus was one of scores that travel daily between Chinatown and the casinos in southeastern Connecticut. The Mohegan Sun caters to Chinese-American gamblers and has estimated that one-fifth of its business comes from Asian spending. Mr. Hartmann said 44,000 buses visit the casino annually from around the region.

Mr. Williams, who was released from a hospital Sunday, was at home Monday but did not appear outside. His friend and neighbor Francisco Rivera said he was a safe driver.

“I think something else happened. … I’ve been in a car with him several times, and I’ve never seen him drive crazy … or swerve,” Mr. Rivera said.

He said there was a death in Mr. Williams‘ family this year and a younger brother was lost “to the streets.”

“And now this happens to him,” he said. “Everybody’s just messed up in the family right now.”