Biden briefed as US flights grounded

BBC Summary

Some domestic flights in the US have been grounded due to a technical glitch with flight control systems.

The Federal Aviation Administration says it is working to fix a problem with the system that alerts pilots to potential hazards.

All flights currently in the air are safe to land, it says.

Departures at two airports have resumed but many flights will remain grounded until 09:00 eastern (14:00 GMT).

The White House says President Biden has been briefed and that there is no evidence of a cyberattack.