GREENWOOD, Miss. (AP) — Officials are adding charges against a Mississippi Delta man they say was launching objects at people along a highway.

Jumearo Williams, 18, is now charged with aggravated assault in addition to earlier malicious mischief charges.

A number of motorists this summer have reported that their vehicles were hit by flying objects or they were run off the road along U.S. 49 between Greenwood and Tchula. Different drivers report being hit by or dodging a bottle, a rock and a bullet-like object.

Williams is jailed on $525,000 bail. It’s unclear if he has a lawyer representing him.

Leflore County Sheriff Ricky Banks says he expects more arrests in the case. The Mississippi Bureau of Investigation and the Mississippi Highway Patrol are handling the inquiry.