OKLAHOMA CITY - Law enforcement agencies in northeast Oklahoma are stepping up the search for a man missing since January.

Thirty-one-year-old Beau Pierce, of Bentonville, Arkansas, disappeared on January 24, 2012. Police believe he disappeared near a casino in West Seneca, Oklahoma.

Tribal Police and the Ottawa County Sheriff's Department searched more than 600 acres of ranch land on Friday.

"I've been in law enforcement for over 35 years, and it's extremely hard to find somebody, especially back in heavily wooded areas like this," said Terry Durborow with the Ottawa County Sheriff's Department.

Family members say casino security cameras show Pierce wandered off drunk from the casino on a very cold and rainy night.