Cricket Australia's investigating an offensive message posted on their Twitter account during play on day three of the second Ashes test at Lord's.
Following third umpire Tony Hill's decision to turn down Steve Smith's catch of Ian Bell, the account posted a message saying the decision ``sucked ass'' then a swear word.
The tweet was quickly deleted and replaced by an apology, saying it didn't come from Cricket Australia's official Twitter activity at the ground.
The organisation fined batsman David Warner for inappropriate tweeting in May.
