According to police, the man threatened staff in the branch with a knife before escaping.
Police attended and are still currently looking for the man.
No one has been injured.
More to follow.
BREAKING: Attempted bank robbery at RBS Dumbarton
BREAKING: Attempted bank robbery at RBS Dumbarton
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules hereComments are closed on this article