Bu nifer o achosion lle anfonwyd gwybodaeth faleisus i ysgolion a oedd yn ffeithiol anghywir ar draws y DU, gan gynnwys ysgolion yng Nghymru. Mae’r achosion hyn bellach yn destun ymchwiliad gan yr heddlu, sy’n parhau. Effeithiwyd ar nifer o ysgolion yng Nghymru yr wythnos ddiwethaf.
There have been a number of malicious hoax communications to schools across the UK, including schools in Wales. These are now the subject of an ongoing police investigation. A number of Welsh schools were affected last week.