Around 200 animal rights supporters staged a demonstration outside the headquarters of a firm which uses animals for drug tests.

The protest was part of a lengthy campaign aimed at closing Huntingdon Life Sciences, which is based near Huntingdon, Cambs.

Police said the demonstration, which began in Peterborough, Cambs, and ended near Huntingdon passed peacefully.

The demonstration was organised by protest group Stop Huntingdon Animal Cruelty (SHAC).

SHAC's campaign against HLS, which runs Europe's largest commercial animal testing laboratory, began in 1999.

But the group's efforts were hampered five years ago after HLS took legal action and a judge limited the numbers allowed to take part in protests.

Large-scale demonstrations resumed in 2007 after SHAC succeeded in getting an order varied so that large groups could gather and megaphones could be used.