AceShowbiz - U.S. officials have denied reports Mark Ruffalo has been placed on a terror advisory list after organizing screenings for a new documentary about natural gas drilling. The "Zodiac" actor arranged showings for "GasLand" earlier this year and voiced his concerns about the effects the practice is having on America's water supplies.

He claimed his efforts to raise awareness and demand a stop to natural gas drilling attracted the attention of officials from Pennsylvania's Office of Homeland Security, who reportedly added him to a terror alert watchlist. But a spokesperson for the security agency has brushed off Ruffalo's revelations, telling EW.com the actor's name is not included on any terror list.

Ruffalo himself is not taking the rumor too seriously. He told GQ this month that he found the whole thing "pretty f---king funny." He added, "It's kind of raaadical."