A man who was having his shoes checked for explosive residue and left in the middle of the inspection forced the closing of LaGuardia Airport in Flushing, NY Friday. The TSA closed the terminal and evacuated it, forcing every passenger to go  through security again. After a long and fruitless search with security dogs without any success, the airport reopened Friday evening.

Authorities stopped looking for the man early Friday evening after conducting an extensive search for him in the terminal, causing flight delays into Friday evening.
“We suspect that he left the checkpoint under the impression that his screening was complete,” TSA spokeswoman Ann Davis said. “The fact that the machine alarmed should not be a cause for concern as some commonly found substances can set it off.”
Outgoing flights at Delta’s terminal D were immediately halted after the man walked away. About an hour later, at 3:48 p.m. authorities evacuated the secure area of the terminal beyond the checkpoints while searching for the man using canine police units. via wnbc.com