The United States is rushing a Federal Bureau of Investigation team and forensic scientists to Mumbai as counter-terrorism officials were reported to be stunned at the level of coordination in the terror attacks in the city.

The FBI team would coordinate with Indian intelligence and security agencies about the planning and evidence collected on the attacks, a media report said in Washington.

The US officials estimate that the widespread carnage could have been carried out for relatively small price tag of between $100,000 (almost 50 lakh) and $200,000 (almost 1 crore), which, they say, is the cost of machine guns, grenades, ammunition and boats used, said ABC News.

The television network said intelligence agencies around the world are scrambling to identify the source of this latest threat in view of the 'remarkable' coordination and sophistication.

The command centres, set up by terrorists in places they attacked, may have allowed them to communicate from site to site. The attacks, US officials said, appear to mimic Al Qaeda [Images] tactics simultaneous attacks on high profile targets in the heart of the financial district.