The national warning system LU-Alert will undergo another round of testing on Monday morning as part of ongoing efforts to fine-tune the platform.

At around 11am, residents in several central municipalities – including Walferdange, Niederanven, Schuttrange, Sandweiler, Hesperange and Luxembourg City – can expect to hear sirens and receive test SMS alerts on their phones.

The trial is being carried out by the High Commission for National Protection (HCPN) and is purely a routine check.

Authorities stress that no action is required from the public.

Additional information and frequently asked questions are also available on the website www.lu-alert.lu.