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A section of Los Angeles International Airport was evacuated late last month when a Stanford University professor was arrested on charges of bringing a World War II-era grenade through a security checkpoint in a carry-on bag.

It has become an all-too-common problem. Transportation Security Administration officers uncovered 136 inert, replica or novelty hand grenades at U.S. airports in 2013.

In addition to the grenades, TSA screeners discovered 1,813 firearms, a 16.5 percent increase from 2012. The 2013 weapons tally represents the fifth year in a row that the number of guns confiscated by the TSA has increased.

Why? One explanation is that more people are flying on commercial flights since the end of the recession.

Of those passengers who have been stopped for trying to carry weapons onto planes, most say it was an innocent mistake.

“A vast majority of people who have prohibited items claim to have forgotten it in their bag,” said TSA spokesman Ross Feinstein.

Another common excuse, he said, is that travelers didn’t realize inert or replica weapons were prohibited. But Feinstein noted that X-ray machines and full-body scanners at airport checkpoints cannot tell the difference between fake and real weapons.

In the latest weapons scare at Terminal 1 at LAX, Los Angeles police officials say Gary Walter Cox, 58, was arrested after TSA officials found the grenade in his carry-on bag.

Cox told the Los Angeles Times that he thought the grenade was inert, but a Los Angeles police bomb squad detonated the grenade and found it contained explosive material.

An LAPD spokesman said he couldn’t confirm that account.

New moms may get more privacy

Legislation that passed the Assembly last week would require the 10 largest airports in California to offer space for mothers to pump breast milk.

The bill, proposed by Assemblywoman Bonnie Lowenthal, D-Long Beach, requires that existing terminals offer rooms with an electrical outlet for the pump and a chair, while new terminals must include rooms with sinks.

San Francisco International Airport is the only major airport that now offers pumping rooms, according to a legislative analysis of the bill.