SIOUX FALLS, S.D. (AP) — Police in Sioux Falls say a masked man lit a modified firework and threw it at a gas station clerk before running off.

The employee of the BP on West Russell Street told officers that the man, who was wearing a black ski mask, lit the device about 10:30 p.m. Saturday threw it at her and then ran off.

The incident remains under investigation.

No injuries were reported.

Copyright 2013 The Associated Press.