Missoula detectives continue to follow leads, but they say so far there is still no sign of the Missoula veteran who disappeared 12 days ago.

NBC Montana told you how 26-year-old Matthew Charlick was reported missing after he left a residence on West Central Avenue on June 15 without his cell phone. He reportedly gave no indication of where he was going, and he hasn’t been seen since.

Officials located his abandoned vehicle Sunday in the Miller Creek area with the keys inside, but no sign of Charlick.

On Tuesday, officials released pictures captured on security camera of a black truck with a red topper near the area where Charlick's car was found, and they are seeking the owner of the truck for any information about the missing veteran.

Charlick graduated from Missoula’s Valley Christian School. We spoke with the principal, who says the entire school is praying for Charlick and his family.

"People all around the country are praying for him, wanting to know what's happening with him,” said Principal Cindy Aznoe. “We're all a very close knit group in the Christian community in Missoula, and at this school in general. We're a family, so we all care for our own, and Matthew was one of our own."

Anyone with information about Charlick is asked to call the Sheriff’s office at 258-4810.