Nearly two-thirds of Americans believe the federal government had warnings about 9/11 but decided to ignore them, a national survey found. Sixty-two percent of those polled thought it was very likely" or "somewhat likely" that federal officials turned a blind eye to specific warnings of the 2001 attacks on the World Trade Center and Pentagon. Only 30 percent said the 9/11 theory was "not likely," according to the Scripps Howard/Ohio University poll. The findings followed a 2006 poll by the same researchers, who found that 36 percent of Americans believe federal government officials "either assisted in the 9/11 attacks or took no action" because they wanted "to go to war in the Middle East." In that poll, 16 percent said the Twin Towers might have collapsed because of secretly planted explosives - not hijacked passenger jets flown into them. And what hit the Pentagon? Twelve percent figured it was a US cruise missile. In the latest Scripps Howard/Ohio University poll, 811 US adults were interviewed Sept. 24 to Oct. 10. Among [other] findings: 42 percent believe the federal government knew in advance of the plot to assassinate John F. Kennedy, compared with 40 percent who call that theory "not likely." 37 percent believe UFOs are real and that the feds have been hiding the truth about them. Eight out of 10 Americans suspect oil companies are conspiring to keep fuel prices high and 50 percent said a conspiracy is "very likely." Only 14 percent felt it was unlikely.