Michael Laudrup's relationship with Swansea City has reportedly been strained since a disagreement last summer.
He was linked with other positions, but stayed on at the Liberty Stadium.
He had been under increasing pressure with the team, however, winning just one of their last ten league matches.
Swansea City are now facing the prospect of a relegation battle.
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Medication designed for animals was taken from the building in Abertillery on Thursday night.
More than a thousand riders will be taking part in a series of events in and around the town.
Some warm spells of sunshine will develop, although scattered heavy and thundery showers are also expected during the afternoon.