UK counter-terrorism police are reportedly looking into an "unknown substance" incident near Salisbury.

A major incident has been declared in the town of Amesbury in Wiltshire. It is feared that two people have been exposed to the unknown substance.

Footage captured this morning (July 4) shows emergency services examining several places in Amesbury that the pair had visited before they fell ill.

The couple were found unconscious at a property in Amesbury, which is near Salisbury, where former Russian spy Sergei Skripal and daughter Yulia were poisoned by a suspected military nerve agent in March.