Flames engulfed a police car after it was set on fire on Sunday.
Police officers were responding to a call inside a property on Vulcan Way, Wallington between 9pm and 9.30pm when they noticed their Vauxhall Astra ablaze.
The officers ran after two male suspects and arrested them.
The two suspects, one aged 22, the other 43, have been bailed to return to Sutton Police station at a later date.
Detective Constable Mark Pascoe, of Sutton CID, appealed for witnesses to come forward.
Call 020 8649 0747 or Crimestoppers anonymously on 0800 555 111.
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