Rex Phillips from the NASUWT union, which represents a large number of teachers at Cwmcarn High School, says they are "shocked and concerned by what appears to be a very serious incident" at the school yesterday.
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Swansea relieved the pressure on under-fire manager Bob Bradley with an emphatic 3-0 home victory over fellow strugglers Sunderland.
Sol Bamba was sent off after losing his cool but Cardiff hung on to claim a deserved 1-1 draw at Ipswich.
Today's rain will soon clear south-eastwards to leave a largely dry night with some long clear spells.