A stretch of an interstate highway in Pennsylvania remains shuttered a day after at least three people were killed and more than a dozen others injured when several vehicles lost control and slammed into each other during a snow squall. Authorities said Interstate 81 north was still closed Tuesday afternoon following the wreck Monday morning amid poor visibility. The crash that involved an estimated 40 to 60 vehicles was captured in videos posted on social media that showed drivers and passengers lining the snowy road and jumping out of the way as the cascade of crashes unfolded. Officials say three fatalities have been confirmed and that number could rise. Twenty-four people were taken to hospitals with various undisclosed injuries.