UPDATE: Court documents reveal love triangle as motive in Blacksburg bombing

According to court documents, the man accused of detonating a pipe bomb in Blacksburg on Wednesday morning was involved in a love triangle with the victim whose car was damaged.

The court documents state that Derick Wilson was unhappy with the fact that his girlfriend, Michele Walker, was living temporarily with her ex-boyfriend, Chad Tangchittsumran. Tangchittsumran's 2001 Chevrolet Blazer was the vehicle damaged in Wednesday's bombing.

About two weeks before the bombing, Wilson and Tangchittsumran got into a fist-fight with each other. Wilson was apparently unhappy that his girlfriend and Tangchittsumran were living together because they previously had an intimate relationship. Walker told police that she and Wilson began dating officially on July 29.

Walker told police Wilson didn't like the idea of Tangchittsumran living with her, but Walker said that the arrangements were made months ago, and she didn't want to leave Tangchittsumran without a place to stay.

The court documents state that just prior to the altercation, Wilson pulled a handgun from his waist area for Walker to hang onto.

After the fight Wilson, Walker, and Tangchittsumran were all at a party at a local lake on July 29. According to the court documents, Tangchittsumran told police that's where Wilson discovered what type of car he drove. Tangchittsumran told investigators that he and Wilson avoided each other at the July 29 gathering.

On the day before the bombing, Walker helped Tangchittsumran move his belongings. At one point, Walker drove Tangchittsumran's vehicle. Walker returned home in Tangchittsumran's vehicle around 10:45 p.m. Tuesday night.

Around 3 a.m. Wednesday morning, Tangchittsumran woke up Walker and asked what happened to his vehicle. That's when they discovered that a pipe bomb had gone off outside of the Blacksburg apartment on Harrell Street.

According to court documents, Walker told police that she received a text message at 3:49 a.m. Wednesday from Wilson asking if she was OK. Walker said it was very unusual to receive a text message from Wilson at that hour.

Court documents also state that Wilson posted pictures on social media of a pipe bomb destroying a small tree. That pipe bomb was similar to the one used in the Blacksburg bombing. Wilson also posted pictures of a pipe bomb on social media, police say.

When police searched the Roanoke home where Wilson was staying, they found an unexploded device in the Bonhill Drive home. Police say that device was similar to the one used in the Blacksburg bombing.

To read the probable cause court document, click here.

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We're learning more about a Roanoke man arrested in connection to a pipe bomb explosion Wednesday morning in Blacksburg and explosives charges in Roanoke.

Derick Wilson joined the Army in February 2009. He fought in the Iraq War from July 2010 to July 2011,  and transferred to the Army Individual Ready Reserve in June 2012 after completing his required active duty service. Wilson spent time training in Fort Benning, Georgia, and in Hawaii.

Also, Wilson was not arrested at his Roanoke home Wednesday. A source close to the investigation tells WDBJ7 that he was detained at the Gold's Gym in Roanoke near Crossroads Mall.

Wilson was interviewed by police and then arrested.

Sources tell WDBJ7 that investigators are looking into military training that might have helped Wilson build an explosive device. We're also told that immediately following the explosion, police re-thought their approach into the area.

Neighbors tell us that he lived at the Bonhill Drive home with his grandfather.

One Roanoke neighbor, who saw Wilson on Wednesday, was very shocked to learn of his arrest.