Here’s what to know about the manhunt.

A man is being held for questioning in connection with last week’s killing of a health insurance executive in Midtown Manhattan, according to three law enforcement officials briefed on the investigation.

The man was identified based on a tip from someone who spotted him in a McDonald’s restaurant, one of the officials said, and was being held Monday in Altoona, Pa.

The man had a gun, a silencer and false identification cards similar to those they believe the killer used in New York, according to one of the law enforcement officials and a person briefed on the investigation. While the man is said to have been in possession of a gun like the one used in the shooting, he has not been arrested or charged, and the authorities have not yet released his name.

New York police investigators are traveling to Altoona, about 280 miles from the city, according to one of the other law enforcement officials.

The police had been looking for the gunman since Wednesday morning’s attack on the executive, Brian Thompson, 50, outside a hotel in Midtown. They believe the killer left New York by bus shortly after.

The killing set off a manhunt that stretched well beyond New York City and commanded days of national attention. The police were still searching for information about the gunman’s identity and motives.

Here’s what else to know:

• New photographs released: The police over the weekend released two images they said showed the suspect, including one of him in the back seat of a taxi on the day of the shooting. They examined thousands of hours of footage from surveillance cameras to glean information about the man’s movements over the course of what they believed were his 11 days in New York City, starting with his arrival on a bus that originated in Atlanta on Nov. 24. They also recovered bullet casings at the scene with the words “depose,” “deny” and “delay” written on them — a possible reference to terms used by insurers to avoid paying claims.

• A recovered backpack: Officers also recovered a backpack in Central Park on Friday that they believe the man may have discarded as he cycled away from the scene of the shooting toward the Upper West Side, before he caught the cab. They had yet to publicly confirm if the backpack belonged to the man or contained any items of value to the investigation. The police found Monopoly money in the backpack, according to a law enforcement official briefed on the investigation.