Police say three of the five people killed in a small plane crash in New Jersey were members of a family visiting from Poland.

Wall Township police said Tuesday that the victims were 38-year-old Andrzej Zajaczkowski of Warsaw, his 14-year-old son, Patryk, and his 6-year-old nephew, Filip Zajaczkowski.

The three were family friends of the plane's owner, 45-year-old Jacek Mazurek, of Kearny. He was killed in the crash, as was the pilot, 46-year-old Wojciech G. Nykaza, of Lodi.

Police Capt. Timothy Clayton says the 6-year-old's parents were at the Monmouth Executive Airport when the plane broke apart while landing and nose-dived into a snowy field Monday, but they did not witness the crash.

A National Transportation Safety Board investigator started work on the case Tuesday.