Police have uncovered another cannabis farm in Oxford after being tipped off that every room in a Headington house was being used to grow the drug.

Police raided the rented house in Valentia Road, on the Gipsy Lane estate in Headington, just after 5pm on Wednesday - and were still at the property at midnight.

A riot van, two Southern Electric vans and several patrol cars were seen, and neighbours were told to go inside their properties by a police dog handler.

Last night Oxford police said they were pleased to have closed down the house.

Valentia Road resident Simon Ambler, 40, said: "When the electricity vans turned up we all came to the conclusion there was a cannabis farm there."

Thames Valley Police spokesman Toby Shergold said: "Police worked through the night with engineers from Southern Electric disabling dangerous illegal electrical works.

"They eventually entered the property and seized cannabis trimmings, a number of plant pots and other hydroponic cultivation paraphernalia. It is believed every room in the house was used for growing plants.

"While the amount of cannabis was not as significant as some recent finds, it's always good to close these places down.

"The dangerous electrics were a potential fire hazard."

Neighbours living next to the semi-detached house told of several hours of drilling as electricity engineers walked in and out of the property with spotlights and torches.

Police have not yet made any arrests in connection with the raid and last night made an appeal for information from members of the public. Anyone who can help should call 08458 505505, or Crimestoppers anonymously on 0800 555 111.

The cannabis farm was the latest in a series to be uncovered across the city.

In a separate operation last month, police raided a house in Cotsmore Road, Rose Hill, and seized 600 cannabis plants with a potential street value of £100,000.

Officers stormed the house and found a sophisticated hydroponics setup in operation. They were called in after neighbours reported seeing youths running from the property clutching plants.