Following Mike Hancock's receipt of legal papers in a High Court civil action, Nick Clegg asked the Chief Whip to convene an urgent meeting under the disciplinary procedures of the parliamentary party between Nick Clegg, Simon Hughes, the Chief Whip and Mike Hancock.
This meeting will take place in Westminster on Monday afternoon. Mike Hancock strenuously denies the accusations.
We are not pre-judging the outcome of the case, but given the seriousness of the allegations, Nick Clegg has instructed the Chief Whip to invoke the disciplinary procedures of the party.
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The man, who was in his 30s, has not been identified, while several other people are believed to have suffered serious injuries.
The Olympian was one of several sports stars who opened up to the prince during an event for his mental health charity Heads Together.
There will be sunny spells, with temperatures peaking at 23 Celsius (73F). However, Northern Ireland will experience frequent showers.