More than one-third of Americans suspect federal officials assisted in the 9/11 terrorist attacks or took no action to stop them so the United States could go to war in the Middle East, according to a new poll.

The survey also found that 16 percent of Americans speculate that secretly planted explosives, not burning passenger jets, were the real reason the massive Twin Towers of the World Trade Center collapsed.

The national Scripps Howard/Ohio University poll of 1,010 adults also found that anger against the federal government is at record levels, with 54 percent saying they "personally are more angry" at the government than they used to be.

Widespread resentment and alienation toward the national government appears to be fueling a growing acceptance of conspiracy theories about the 2001 attacks on the World Trade Center and the Pentagon.