The wife of bombing suspect Ahmad Khan Rahami left the United States days before the explosions in New York and New Jersey, according to reports.
An unnamed law enforcement source told CNN officials are working with their counterparts in Pakistan and the United Arab Emirates to get in touch with her.
Rahami married his wife in Pakistan and brought her to the USA but she left the country days before the attacks, it is reported.
Authorities are investigating whether Ahmad Rahami, who was not on US counter-terrorism lists, acted alone or as part of a terror cell.
Investigators studying CCTV footage may have identified the same man at each location, law enforcement sources reported to have said.
At least 29 people have been injured in an explosion which rocked Manhattan. Here's what we know so far.