Police and FBI officials have descended on an apartment building in Stamford, Connecticut where the driver lived.
Teams wearing hazardous materials suits appeared to be preparing to enter the building and bomb squad truck was seen driving to the area.
Residents said they had been evacuated shortly after 5pm local time (10pm UK time).
More top news
The backroom staff were on hand with insect repellent to help with the problem in Volgograd.
The former attorney general says he hopes a ‘sensible compromise’ is still possible ahead of a crucial Commons vote.
The department store chain blamed competitor discounting and market weakness for knocking sales.