WASHINGTON - THE odds that terrorists will attack a major city with nuclear or biological weapons are now higher than ever due to threats from rogue states, nuclear smuggling networks and the spread of weapons know-how, according to a bipartisan task force created by the US Congress, The Washington Post reported on Tuesday.

'In our judgment, America's margin of safety is shrinking, not growing,' said the draft report from the Commission on the Prevention of Weapons of Mass Destruction Proliferation and Terrorism, cited by the Post.

'Without greater urgency and decisive action by the world community, it is more likely than not that a weapon of mass destruction will be used in a terrorist attack somewhere in the world by the end of 2013,' said the commission, which interviewed more than 200 experts since May in preparing its findings for Congress and President-elect Barack Obama.

The panel called on Mr Obama to take 'decisive action' after he becomes president on January 20 to reduce the threat of an attack with weapons of mass destruction.

The report cited Pakistan as cause for serious concern because of terror networks that operate there, as well as the country's nuclear arsenal and history of political instability.

'Pakistan is our ally, but there is a grave danger it could also be an unwitting source of a terrorist attack on the United States - possibly with weapons of mass destruction,' it said.

The draft report's reference to Pakistan came after India on Monday formally accused 'elements' in Pakistan of being behind the bloody rampage in Mumbai last week that left at least 172 dead and close to 300 wounded.

According to the commission, terrorists are more likely to secure materials for a biological attack than to purchase or steal nuclear weapons, but the growing supply of nuclear material and technology on the global black market meant the nuclear threat was also rising.

The commission, which is led by former senator Bob Graham of Florida, a Democrat, and former House representative James Talent of Missouri, a Republican, was established by Congress in 2007, fulfilling a recommendation from the 9/11 commission - which examined the causes of the attacks of September 11, 2001.

The report calls for international action to secure unguarded nuclear weapons material such as uranium and plutonium and stepped up efforts to disrupt smuggling networks that sell nuclear technology.

The panel also urges making the nuclear Non-Proliferation Treaty (NPT) much tougher, introducing strict penalties and bolstering the International Atomic Energy Agency to conduct inspections and enforce rules in a more aggressive manner.

It said Mr Obama should adopt a tough approach to both Iran and North Korea and that the United States should lobby to ban the two states from adding to their stockpiles of enriched uranium and plutonium.

Both countries pose a threat in their own right but their nuclear ambitions also increase the chance of triggering a dangerous arms race, the report said. -- AFP