SEASIDE PARK, N.J. -

Officials trying to determine the cause of a fire that leveled four blocks of bars, pizza shops and ice cream stores on a Jersey shore boardwalk say lingering hot spots could delay the investigation.

Officials say the hot spots could keep flaring up for days in an area that was just recovering from Superstorm Sandy.

The fire raged for hours Thursday, sending fireballs into the sky over Seaside Heights and Seaside Park and reducing more than 30 businesses in the neighboring towns to charred remains.

Gov. Chris Christie cautions not to speculate about the cause.

Like other fires, it's being treated as a crime scene for now.