NYPD tightens security after Brussels bombings

After three bombings shook Brussels on Tuesday morning, the New York Police Department will visibly increase its presence at local airports and at train and subway stations, NBC News reports.

Early reports suggest at least 21 were killed in two explosions at Zaventem Airport and a third explosion at a metro station near European Union institutions.

The NYPD told NBC it was increasing security at mass-transit points, bridges, and tunnels and major city landmarks, which has been a standard NYPD response after major terrorist incidents overseas.