On Monday, October 12, 1654, shortly after half past eleven in the morning, one of Delft's powder magazines exploded and devastated a large part of the city. The "Delfische Donderslag" (Delft Thunderclap) was said to have been heard as far away as the island of Texel, seventy miles north of Delft. The magazine, known as the Secreet van Hollandt, had been established in the former Clarissenklooster (Convent of Saint Clare) in the northeastern corner of Delft in 1572. When the magazine, large parts of which were underground, exploded, it contained about ninety thousand pounds of gunpowder. The force of the blast was so great that most houses in the immediate vicinity were destroyed and buildings throughout the city were damaged. The two major churches, the Oude and the Nieuwe Kerk, were also damaged. Although the number of people killed is not known, it has been estimated that deaths were in the hundreds. Among the casualties was one of Delft's most famous painters, Carel Fabritius. News of the event spread rapidly throughout the country. The States General sent a note of condolence; Elizabeth, queen of Bohemia, paid a visit; and many other people came to survey the devastation.