HARRISBURG, Pa. (AP) — A section of Interstate 81 near Harrisburg was expected to remain closed in both directions for the next several days after a tanker truck fully loaded with diesel fuel overturned Thursday morning and exploded into flames, sending black smoke billowing into the sky.

Officials said the crash occurred on an on-ramp to Route 22-322, where the ramp curls back over the interstate and runs under another section of Route 22-322. They said the intense heat buckled steel beams on the top section and damaged it so badly there were fears it could collapse and fall onto I-81.