All lanes of I-77 S between Two Notch and Killian Roads in Columbia are open after an afternoon accident caused traffic to slow to a standstill.

An accident in I-77 S at Exit 17 (Two Notch Road) had lanes closed for more than two hours Thursday afternoon.

Heavy congestion was reported as far back as I-77 S at Exit 22 (Killian Road).

Traffic moved as slow as 4 mph at one point, according to SCDOT.

There was no word on any injuries.