Iran has rejected a New York judge's finding that Tehran is liable in the September 11 attacks along with the Taliban and al Qaeda.
According to state TV, Iran's foreign ministry spokesman referred to last week's judgement as "clumsy scenario-making" by the US.
The spokesman, Ramin Mehmanparast, repeated Iran's insistence that al Qaeda has no presence in the country.
On Thursday, Judge George Daniels in Manhattan signed a default judgement finding Iran, the Taliban and al Qaeda liable in the 2001 attacks. The ruling came in a $100 billion lawsuit brought by family members of victims.
The findings also said Iran provides al Qaeda members a safe haven.
Iran's President Mahmoud Ahmadinejad has repeatedly denied any Iranian connection to the September 11 attacks or to al Qaeda.