DESOTO COUNTY, MS- (WMC-TV) - The Mississippi Bureau of Investigation said it has gotten hundreds of tips, but none of them have cracked the case of the highway killer yet.

They will continue to investigate each and every one as if it may be the tip they need to catch the person responsible for two shooting deaths on North Mississippi highways.

Investigators said there is a chance the killer could cross state lines and they are on high alert.

As investigators continue to dig up new leads, police and sheriff's deputies are being vigilant in search of anything unusual.

Two people were shot and killed on the side of Mississippi highways in the month of May.

One of the victims was 74-year-old Tom Schlender from Raymond, Nebraska.

MEMPHIS, TN- (WMC-TV) – The Mississippi Highway Patrol is warning drivers to be cautious while being pulled over as they investigate two deadly highway shootings.

The Mississippi Highway Patrol's Bureau of Investigation said there are similarities between both incidents.

"The concern is that someone is posing as a law enforcement officer and that is how these vehicles end up on the side of the road," said MBI Director Lt. Col. Larry Waggoner in a written statement.

Both deadly shootings happened on Mississippi highways.

"I know there are a lot of rumors. We don't know anything right now that is concrete. Due to some of the evidence at the scene, lead us to believe both subjects that were killed were on the side of the road. You can speculate about different things. We are not eliminating anything as a possibility on how they got on the side of the road," said John Champion, district attorney.