Derbyniodd yr heddlu wybodaeth am grŵp o derfysgwyr The police received information about a group of terrorists Roedden nhw`n cuddio mewn tŷ ar gyrion y dref They were hiding in a house on the outskirts of the town Roedd y terfysgwyr yn cynllunio ymosodiad The terrorists were planning an attack Gwnaeth heddlu arfog gyrch ar y wawr, ond yn darganfod bod y tŷ yn wag Armed police made a raid at dawn, but discovered that the house was empty Roedd y grŵp wedi dianc yn gyflym, gan adael nodiadau a mapiau ar ôl The group had quickly escaped, leaving behind notes and maps Roedd y grŵp yn bwriadu ymosod ar y maes awyr gan ddefnyddio ffrwydron, a rhoi gwenwyn yng nghyflenwad dŵr y ddinas The group intended to attack the airport using explosives, and put poison in the city`s water supply Ar yr adeg hon derbyniodd yr heddlu newyddion bod pobl wedi torri i mewn i`r gwaith trin dŵr At this time the police received news that people had broken into the water treatment works Dywedodd yr heddlu wrth beirianwyr i atal y pympiau dŵr ar unwaith The police told engineers to stop the water pumps immediately Dangosodd prawf dŵr fod gwenwyn wedi`i ychwanegu A water test showed that poison had been added Anfonodd yr heddlu rybudd i`r maes awyr, ond roedd y terfysgwyr wedi ffoi The police sent a warning to the airport, but the terrorists had fled Wythnos yn ddiweddarach ar ôl chwiliad enfawr gan yr heddlu, daethpwyd o hyd i’r gang a’i arestio A week later after a huge search by the police, the gang was found and arrested |