Deadly Fiery Crash on I-93 in Derry

One person was killed in a fiery crash on I-93 south in Derry that backed up traffic for hours Wednesday night.

State Police said a tractor-trailer and a passenger vehicle collided and both burst into flames around six p.m. near exit 4.

The highway reopened shortly after 11 p.m.

The cause of the crash was not immediately known.