Washington ? Weapons hunters in Iraq are pursuing tips that point to the possible presence of anthrax and Scud missiles still hidden in the country, the chief searcher said Sunday.

David Kay told Congress last week that his survey team had not found nuclear, biological or chemical weapons so far.

But he argued against drawing conclusions, saying he expected to provide a full picture on Iraq’s weapons programs in six months to nine months.

While lacking physical evidence for the presence of anthrax or Scuds, Kay said tips from Iraqis were motivating the search for them.

Critics, including many in Congress, said Kay’s findings did not support most of the Bush administration’s prewar assertions that the United States faced an imminent, serious threat from Iraq’s Saddam Hussein because of widespread and advanced Iraqi weapons programs.

President Bush has said the U.S.-led war on Iraq was justified despite the failure to find weapons.

Kay reported that searchers found a vial of live botulinum bacteria that had been stored since 1993 in an Iraqi scientist’s refrigerator.

The bacteria make botulinum toxin, which can be used as a biological weapon, but Kay has offered no evidence that the bacteria had been used in a weapons program.

The live bacteria was among a collection of “reference strains” of biological organisms that could not be used to produce biological warfare agents.

Kay said Sunday the same scientist told investigators that he was asked to hide another much larger cache of strains, but “after a couple of days he turned them back because he said they were too dangerous. He has small children in the house.”

Kay said the cache “contains anthrax, and that’s one reason we’re actively interested in getting it.” Kay, speaking on “Fox News Sunday,” did not say whether the anthrax was live or a strain used only for anthrax research.

Before the war, Iraqis said they had destroyed their supply of anthrax. Inspectors haven’t found any, and Iraqis haven’t been able to provide evidence to satisfy investigators that they did destroy it.