A testing centre in the Netherlands has been hit by an explosion in what police believe may be a targeted attack.
The explosion was just before 7am near the health service's testing centre in the town of Bovenkarspel, north of Amsterdam.
Police are investigating whether the attack, which shattered the building's windows, was deliberate.
"Something like that doesn't just happen by accident," police spokesman Menno Hartenberg told media.
Broadcaster NOS reported a metal pipe exploded outside the centre but that is yet to be confirmed.