It is understood the devices are commonly used to set cars on fire
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Animal rights extremists are being linked to the discovery of two fire bombs at a house, police have said.
The occupants of the house where the devices were found are said to be connected to animal testing organisation, Huntingdon Life Sciences.
Police are quizzing five people over the find on a driveway of the house in Reading, Berkshire, on Sunday.
A second device was found on Monday at the house in Caversham and a 39-year-old man was arrested nearby.
The four other people, two men and two women, were arrested on suspicion of conspiracy to cause explosions during a raid on Monday night.
It is understood the devices found are commonly used to set cars on fire.
Detectives suspect animal rights as the motive, a Thames Valley Police spokeswoman said.