Rasool Allah [saws] advised all the Muslims to fast on 10th of Moharram, as it has lot of 'sawaab' from Allah [swt]. Also advised not to fast one day, as Jews do, but fast either on 9th & 10th OR 10th & 11th.
As per Omani calendar today is 8th Moharram, so tonight if we do 'sehr' then we can fast for 9th [Tuesday] & 10th [Wednesday].
Kindly convey this message to all your acquaintances.
Fi amaanillah
Sahibzada Mahmood