DENVER -- An American construction worker has been detained in the mountains of Pakistan after authorities there found him carrying a sword, pistol and night-vision goggles on a solo mission to hunt down and kill Osama bin Laden.

Catching bin Laden was Gary Brooks Faulkner's "passion," his brother said, noting that the 50-year-old has been to Pakistan at least six times, learned some of the local language and even grew a long beard to blend in. Relatives and acquaintances said Faulkner is a devout, good-humored Christian who requires dialysis and did time in prison years ago.

"A lot of kids grow up and say, 'I want to be Rambo,' you know? Well, he is," said Faulkner's brother, Scott Faulkner, 43.

Gary Faulkner arrived June 3 in the town of Bumburate and stayed in a hotel there. The Greeley, Colo., man was assigned a police guard, as is common for foreigners visiting remote parts of Pakistan.

When he checked out without informing police, officers began looking for him, according to the top police officer in the Chitral region, Mumtaz Ahmad Khan. Faulkner was found late Sunday in a forest.

"We initially laughed when he told us that he wanted to kill Osama bin Laden," Khan said. But when officers seized the weapons and night-vision equipment, "our suspicion grew." He said the American was trying to cross into the nearby Afghan region of Nuristan.

Chitral and Nuristan are among several rumored hiding places for bin Laden along the mountainous border between Afghanistan and Pakistan.

On Tuesday, Faulkner was being questioned by intelligence officials in Peshawar. He has not been charged with any wrongdoing.

Scott Faulkner dropped his brother off at Denver's airport May 30, and the two discussed the possibility Faulkner would not return alive from his search of bin Laden.

Bin Laden, who is also reported to have kidney problems, has evaded a massive manhunt since the Sept. 11, 2001, attacks on the United Statess. The federal government has offered a bounty of $25 million for information leading to his capture.