New York police are looking into the causes of the rowdy scene at South Street Seaport in Manhattan on Tuesday night when an overcapacity crowd turned out for a free concert by the rapper Drake and the pop band Hanson.

 

The concert space at the Seaport can hold about 10,000 people, but some reports put Tuesday's capacity at 25,000, and some fans became unruly, tossing bottles and even chairs. The plug was pulled around 7 p.m., before the headliners had performed.

 

The police made two arrests, for disorderly conduct and obstructing governmental administration. Seven people were injured, the police said, and one officer injured his back helping a fan who had climbed a wall.

 

NY Police Commissioner Raymond W. Kelly called the security force at the Seaport insufficient and said the police were studying the event. “We’re taking a hard look at it ourselves to see what the appropriate mechanisms or configuration of that area should be,” Mr. Kelly said. “We want to look at how this particular event was promoted. We want to learn from this.”