Updated

South Carolina police say they are "confident" that they are narrowing in on a quadruple murder suspect who has evaded authorities for nearly a week after allegedly shooting at deputies during a 100 mph high-speed chase.

"We are confident (Tyler Terry) is within our perimeter," the Chester County Sheriff's Office tweeted Sunday evening. "Our perimeter has become thicker and is layered. We are sending teams inside in attempts to find him and force him out." 

The sheriff's office said earlier it was maintaining "heavy patrol presence in the Richburg and Fort Lawn area." 

Both Highway 9 and Richburg Road have been shut down. The sheriff’s office was asking nearby residents to "lock their doors, secure their firearms, stay inside, and report suspicious activity around trash cans, barns, etc." 

A manhunt began Monday around 11 p.m. when deputies attempted to pull over a "suspicious vehicle."

The driver refused to stop and fled deputies, reaching upward of 100 mph. Police told FOX 46 Charlotte that Terry fired multiple shots during the chase, hitting two police cars. 

Tyler Terry, left, and Adrienne Simpson. (  (Chester County Sheriff's Office))

The chase came to an end when the car crashed and Terry allegedly fled, but the driver, Adrienne Simpson, was arrested at the scene. She is also facing at least one murder charge. 

SOUTH CAROLINA SHOOTING AT ‘UNAUTHORIZED’ CONCERT LEAVES GIRL, 14, DEAD; 14 OTHERS WOUNDED: REPORT

The FBI was offering a $12,000 reward for information leading to Terry’s capture. 

Terry has been charged in four murders, most recently for the death of Eugene Simpson, whose body was discovered on Thursday. Terry is also accused of a double murder in Missouri and another murder in York County, just north of Chester County, in South Carolina.

He is also wanted for five attempted murder charges stemming from a shooting in Chester on May 2, as well as other criminal activity. 

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On Saturday, police told residents to stay vigilant of their "barns, crawl spaces and outbuldings."

"Additionally, please contact our tip line if you have any deer cameras in or around the area we are searching," the sheriff's office tweeted. "Do not retrieve them yourselves. We will send someone to your address to take care of that."

Fox News’ Paul Best contributed to this report.