PITTSBURGH — Pittsburgh Steelers offensive line coach Larry Zierleinapologized Thursday for accidentally e-mailing an explicit sex video to numerousNFL employees, including league commissioner Roger Goodell.

Zierlein said the incident has been difficult for him and his family andthat he intends to use his team-issued computer only for football business fromnow on. He sent a note of apology to all NFL employees and those with theSteelers who received his raunchy e-mail.

“It’s hard because I made an inexcusable mistake,” Zierlein said,discussing the matter for the first time. “It was hard first for theorganization. They had to explain and go through … and my family, for whatthey’re going to have to hear. So it was tough, but when you’ve been at thisstuff for as long as a lot of us have, tough things happen and you’ve got tomove on and that’s what we’re doing.”

The incident is the first blemish on new Steelers coach Mike Tomlin and hisstaff, and it clearly bothered team chairman Dan Rooney — a Hall of Fameexecutive and one of the league’s most respected owners. It is uncertain if theSteelers, or the NFL, will discipline Zierlein, though Rooney has talked to him.

“I’d rather just keep it within,” Zierlein said, asked what the Steelerssaid to him. “I will say this is a very supportive organization.”

The problem occurred two weeks ago when Zierlein — a 61-year-old grandfather– intended to forward the video clip, which was e-mailed to him by anotherSteelers employee. However, Zierlein accidentally e-mailed the video to numerousleague personnel, causing staff members with other NFL teams to begin discussingthe foul-up.

“It was 100 percent unintentional,” Zierlein said. “I don’t even know howto mass e-mail. I don’t know these machines very good, it was just a 100 percentunintentional thing. Hit the wrong button. It’s something I really regret forobvious reasons: for the organization, for my family, for the whole thing. It’sbeen a tough deal, but it’s like anything else. You learn from it and you moveon.”

Zierlein did not explain why, when after he initially viewed the video hedidn’t delete it rather than attempting to e-mail to someone else.

“I’m not very good at these machines and I hit the wrong button,” Zierleinsaid. “There’s nothing else to say, no other explanation.”

Zierlein was hired in January after Tomlin replaced Bill Cowher as coach.Zierlein has been a coach since 1970, working at the Texas high school level,collegiately at Houston, Cincinnati, Tulane and LSU, and in the NFL with theBengals, Bills, Browns and Steelers.