Burma's military junta has charged pro-democracy leader Aung San Suu Kyi with breaching her detention conditions.

The breach relates to an incident last week involving an American man who reportedly swam across a lake to spend two nights at the opposition leader's home.

The authorities caught him when he was swimming back.

Her lawyer says she will face trial over the incident next Monday.

Security measures have been been beefed up around her home as a result.

Ms Suu Kyi has been under house detention for 13 of the past 19 years since she won national elections in 1990.

Her latest home detention order is due to lapse in less than two weeks.

She has been suffering poor health in recent days.