NEWARK, New Jersey - Security forces began allowing passengers back into Newark Airport's Terminal A after the terminal was shut for more than half an hour early on Monday because of a suspicious package, a Reuters witness said.

Officials determined the suspicious package contained a computer monitor, 1010 WINS radio reported.

The shutdown at Newark's Liberty International Airport, one of three major airports serving the New York City metropolitan area, came during the busy holiday travel season when authorities are on high alert for any security threats.