If you believe you or someone else is in immediate danger, do something straight away - contact 999 and tell the operator what is happening.
Os ydych chi’n credu eich bod chi neu rywun mewn perygl ar hyn o bryd, mae angen i chi ymateb yn syth - ffoniwch 999 a dweud wrth dderbynnydd yr alwad yr hyn sy’n digwydd.