UPDATE: Bergen County father and his 4 daughters die in Delaware crash, police say

Four children and an adult from a New Jersey family were killed in a crash in Delaware on Friday afternoon when their minivan was hit by a truck that had crossed over into their lane, authorities said.

A sixth passenger, an adult who was in the front passenger seat was taken to the hospital with "non-life threatening injuries," Delaware State Police Sgt. Richard Bratz said.

Police did not release the names of the New Jersey residents that were killed and, as of 9:30 p.m. Friday, police still had not notified their next of kin.

A pickup truck traveling south on Route 1 in Townsend crossed over the center median at 3:47 p.m. and struck a car traveling north on the other side of the highway before also plowing into the mini van, Bratz said.

Bratz said police are still investigating why the pickup crossed over the median.

#UPDATE: 5 confirmed dead in Townsend, #Delaware multi-vehicle crash on route 1, at least 2 survivors @CBSPhilly pic.twitter.com/BSzcBTajJ7 — Chantee Lans CBS Philadelphia (@ChanteeLans) July 6, 2018

The occupants in the two other vehicles did not suffer serious injuries, Bratz said.

Chris Sheldon may be reached at csheldon@njadvancemedia.com. Follow him on Twitter @chrisrsheldon Find NJ.com on Facebook.