Four people were shot in three episodes in Midtown Manhattan, and the police said they arrested 33 people as rowdy crowds roamed the area in the waning hours of Sunday and early Monday in what has become something of a violent Easter Night ritual.

No one had been arrested in any of the shootings — two near Times Square and the other near Pennsylvania Station — by midmorning Monday. The four people who were shot were in stable condition at hospitals in Manhattan, the police said.

The police said they had assigned extra manpower to Times Square on Sunday evening because they were concerned about crowds leaving the New York International Auto Show, which opened on Friday at the Jacob K. Javits Convention Center, on 11th Avenue near West 34th Street.

While the trade show itself has not experienced problems, the spillover of revelers into Times Square following the show on Easter Sunday has led to mini riots in recent years. In 2006, a teenager was stabbed; the following year, a teenager was slashed in the arm.