According to the CBS News, while the Federal Bureau of Investigation (FBI) is struggling with numerous leads into the botched May 1 terror plot, the probe until now clearly indicates that Shahzad primarily plotted the terror attack on his own and only took some help from others in its execution.
In one sense, Shahzad was a 'lone wolf,' with evidence suggesting that he alone bought, assembled, and delivered his botched IED. But, sources say it's also clear that he had some help, drawing inspiration, financial support and bomb training from the Pakistani Taliban, the CBS report said.
Both the Pakistani and US authorities have detained several persons for their alleged role in the bombing plot, but none of the arrests have been 'conclusively' linked to the attack.
Even the Pakistan Army Major, who was arrested for having alleged telephonic conversations with Shahzad, was released last week without any charges being levelled against him.
Many have described Shahzad's failed bombing attempt as 'amateurish', but former Central Investigation Agency (CIA) officials Phil Mudd warned that the investigation agencies should not take comfort in that tag.
"Everybody's an amateur until people die, even people who have limited training and limited access to an Al Qaeda trainer, or no access, can kill tens or hundreds," Mudd said.
The Obama administration is concerned over there being many 'radicals' like Shahzad having links with some terror organisations who aim to launch an attack against the US, the report said. (ANI)