Washington has ordered United States airlines to clamp a tight security ring round their airport facilities to combat future bombing attempts. Secretary of Transportation John Volpe called together 90 heads of aviation for White House talks yesterday (Friday) -- a meeting prompted by the discovery of bombs aboard three U.S. airliners earlier in the weak.

As a result, security precautions due to be introduced this summer have been rushed into operation. Screening of crews, passengers and baggage will be more thorough. Agents of the Federal Aviation Administration (F.A.A.), U.S. Marshals and even Sky Marshals will be used for ground security duties.

After Friday's meeting, a White House official explained details of the new security measures to newsmen:
SYNOPSIS: Ninety leaders of the United States airline industry converged on Washington on Friday for an aviation summit on improving airport security. National anxiety was still running high after the discovery of bombs planted aboard three airliners earlier in the week. At Washington airport, security cars kept up intensive patrols.

As a result of the White House meeting, chaired by Transportation Secretary John Volpe, new security measures planned for the summer have been rushed into use. These measures were explained at a news conference:
Passengers and baggage screening is now mandatory. And new screening devices have been introduced. International action against bomb threats and hijacking was also discussed: