Two Arlington, Va. men have been arrested on charges of capital murder in the death of Texas pastor Clint Dobson.

Prosecutors said Steven Lawayne Nelson, 24, and Anthony Gregory Springs, 19, used a plastic bag to suffocate Dobson inside NorthPointe Baptist Church during an attempted robbery.  The men have also been accused of also attacking Dobson's assistant. 

The suspects "began laughing and making inappropriate comments about Dobson's death" Thursday, according to the arrest warrant affidavit for Nelson. "When confronted about this behavior, [Springs] produced an item he claimed belonged to Dobson."

Local police officials said they're building a case that will be "fully prosecuted in court."

"What we've been able to achieve so far very much is due to public cooperation," Arlington Police Chief Theron Bowman said Monday at a news conference at police headquarters.

Prosecutors said it's too early to say if they will seek the death penalty.

Meanwhile, members of the NorthPointe church have remained steadfast in their faith despite the murder of their pastor.

"We're at a time when the darkness perhaps has enshrouded us, and in the midst of tragic, hard, awful times even when we can't see, we keep believing in Jesus," Dr. Dennis Wiles, senior pastor of First Baptist Church Arlington, told the congregation Sunday.

"We're going to keep believing," he said. "The truth has not been abrogated today even in the face of such tragic violence."

The funeral for Dobson, who was a distant relative of Focus on the Family founder Dr. James Dobson, will be held on Wednesday at First Baptist Church of Arlington.  He is survived by his wife, Laura Dobson.