Meredith Land, NBC 5 News
The FBI has charged Anson Chi with possession of an explosive device in connection with an explosion near a gas line in Plano.
FBI court documents identify Anson Chi as the man suspected of trying to blow up a gas line in Plano earlier this week.
The FBI filed a criminal complaint against Chi, 33, on Wednesday for possession of an explosive device.
Chi was found severely injured near an Atmos Energy gas line along West Parker Road on Monday after an explosion.
He originally told police he was hit by a car, but evidence at the scene indicated he was trying to tamper with the natural gas system when a homemade bomb he was carrying detonated.
Investigators first searched Chi's Plano home in the 3200 block of Anchor Road on Monday and found several explosives.
Agents searched the home for a second time Thursday, but did not reveal what they were looking for in the second search.
In a video posted on YouTube in 2007, Chi expressed anger over having to pay taxes.
Court documents show he pleaded guilty to a weapons charge in California in 2008. He is also wanted on a probation violation there.
Chi is still in the hospital in critical condition. Investigators have not spoken with him yet about the explosion.
He has a court date set for Monday related to the incidents in California. A date has not yet been set on the explosive device charge.