UKIP party chairman Paul Oakden has said the outcome of the investigation into a clash between two of the party's MEPs will be announced before the leadership battle restarts.
Oakden said all witnesses "in and around" the area where MEPs Steven Woolfe and Mike Hookem had their "altercation" had been questioned over the incident.
The two MEPs have conflicting versions of events with Woolfe - the previous leadership front-runner - saying the injuries which left him in hospital after the encounter were not consistent with merely a fall or seizure, while Hookem insists he did not hit his colleague.
Describing the altercation as "one small incident", Oakden told the BBC Radio 4 Today programme: "The investigation will certainly conclude before the close of nominations for the leadership campaign."
As for the campaign itself, UKIP's national executive committee meets to set out the rules of the new leadership contest after Diane James quit the post after just 18 days.
Oakden said: "We are going to be taking our time. We are going to be doing it in a very calm and collected fashion to make sure that we get the right results.
"There is no need to rush. There isn't any need to panic ourselves into getting a new leader into place quickly."