When the Romans tried to start the torture over the next day, in the middle of the torture, an earthquake occurred at a near by volcano.
This frightened the people in the town/city, and the Roman prefect ordered the torturing to stop.
Within a day, Saint Agatha died peaceably in her cell within a die -- not suffering anymore torture.
Saint Agatha, Pray for us!
There is also a story of the burning down of the National Headquarters for the Klu Klux Klan.
A bolt of lightening struck the building and burned it to the ground.
Just prior to that, the KKK were threatening a group of Saint Katherine Drexel's nuns in Beaumont, Texas. The saint (still alive on earth) prayed for the protection of the nuns.
After the National Headquarters burned down, it was somehow correlated that it was related to the threats on the nuns.
This particular story I have to research more to find more facts and dates to substantiate...