No arrest - a press conference was scheduled for 5 pm but postponed.

The arrest speculation began not long after the release of surveillance video taken from outside the Lord and Taylor department store that appeared to show a man placing a package on the sidewalk outside the store, then walking away. The second explosion occurred just outside the store.
According to numerous U.S. media outlets, the man is seen clearly in the footage, which has been enhanced by video forensics experts. The video may have been recorded by the department store's security cameras.