Hit TV series Mad Men was filming an episode at Los Angeles International Airport (LAX) when a deadly shooting incident occurred, according to tweets from a production staffer.

Dustin Woods, a key grip on the US drama, tweeted that the series was filming in terminal 4 at LAX, one terminal away from where a gunman opened fire with an assault rifle about 9.30am local time on Friday, Variety magazine reported.

"We are filming at LAX. Gun fire. Locked down. Evacuating!," Woods tweeted, followed later by, "Still in lock down. #mydayinla."

Woods tweeted to TV Guide's Michael Schneider that the show he was working on was Mad Men, noting that it was the program's first day back shooting its seventh and final season, Variety reported.

US network AMC, which airs Mad Men, declined to comment.

One person was killed and three others wounded when a man pulled a semi-automatic rifle from a bag and shot his way past a security checkpoint at the airport on Friday, in an attack that disrupted flights across the US.

Officials said the gunman, who was wounded in a shootout with police and taken into custody, was targeting security staff.

A law enforcement official said the shooting suspect was Paul Ciancia, 23, from New Jersey.