Metro police check train. (WMATA)

Officials at area airports and the Metro system said Friday they are continuing enhanced security measures, first put into place on Monday after the bombings at the Boston Marathon.

“We’re very closely monitoring the situation,” said Metro spokesman Dan Stessel about developments overnight in Boston. He said the system has been operating at a heightened level of security since Monday.

Among the additional measures put into place: extra K9 units and increased police at rail stations.

As part of an effort to enhance overall security throughout the system, Metro officials are also installing new security cameras at stations that will have the ability to record audio as well as video.

Area airports have also increased security following the Boston bombings. At Reagan National and Washington Dulles International, K9 units are conducting additional inspections in and around airport property.