Saturday marks 20 years since the Sept. 11 terrorist attacks, during which nearly 3,000 people died. Newport News Shipbuilding will honor those lost during the attacks with a whistle blow.

The shipyard whistle will sound for 20 seconds on Saturday, Sept. 11, at 8:46 a.m. – the same time hijackers crashed the first plane into the north tower of the World Trade Center 20 years ago.

Those working on Saturday are asked to observe a moment of silence.