A fire that ripped through a Jehovah’s Witness Kingdom Hall in Washington state Friday is now the fifth blaze in an apparent series of attacks targeting houses of worship in the area during the past nine months.

The Seattle Division of the Bureau of Alcohol, Tobacco, Firearms and Explosives said Saturday the agency determined the fire at the Jehovah's Witness Kingdom Hall in Lacey was an arson.

The Thurston County Sheriff's Office said the blaze was reported around 3:42 a.m. and prompted a response by the ATF and a local task force that's been looking into attacks targeting other Kingdom Halls in the county, located about 70 miles southwest of Seattle.

“Makes you feel really ill about somebody who has some sort of animosity towards any religion,” Thurston County Sheriff John Snaza told Q13 News.

Since March there have been five attacks at Jehovah’s Witness Kingdom Halls in Thurston County. Two arsons took place on March 19 at Kingdom Halls in Tumwater and Olympia with minor damage reported, according to the ATF.

The third incident was reported May 15, when someone fired 35 rifle rounds at a Kingdom Hall in Yelm and caused more than $10,000 in damage. Someone then returned back to the building in Olympia on July 3 and set a fire that destroyed the building.

In August, someone tried to set fire to the Kingdom Hall in Yelm. Church elders at the time had arrived to find fire logs stacked up against an outside wall that was smoldering, Q13 News reported at the time. They were able to douse the logs with water and prevented any further damage to the building.

“More or less they’re terrified,” Snaza told Q13 News. “Why are they being targeted? Why is this specific religion being targeted?”

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Dan Woollett, a minister at Lacey Kingdom Hall, called the blaze on Friday "devastating" for the whole congregation.

“It’s devastating for sure but you know it’s just a building," he said. "Everybody’s safe and that’s the important thing."

The ATF said authorities are offering up to a $36,000 reward for information in the case.

No injuries have been reported in any of the incidents, but Seattle ATF agent Derek Pleasant told Q13 News that "it is inevitable that innocent people will be injured or killed if these incidents go unchecked."

"We take events at houses of worship very seriously and are appealing to those who live in and around Thurston and the surrounding counties to partner with us in protecting their communities in this investigation," Pleasant said.

A spokesperson for Jehovah's Witnesses told Fox News there are over 33,000 worshippers in Washington state who meet in 163 Kingdom Halls.

"Jehovah’s Witnesses work hard to be a force for good in their community, so violent acts like this are difficult to comprehend," David A. Semonian told Fox News. "We are grateful for the efforts of the authorities to apprehend those responsible and restore safety and security for both our fellow worshippers and their neighbors."

Anyone with information on the fires or the shooting at the religious facilities is asked to call ATF's toll-free hotline at 888-ATF-TIPS, Crime Stoppers of South Sound at 1-800-222-TIPS, or the Arson Alarm Foundation at 1-800-55-ARSON.