He had planned to work the salt flats on the beach, encrusted with crystallized sea salt at every high tide, but the police had forestalled him by crushing the salt deposits into the mud. Nevertheless, Gandhi reached down and picked up a small lump of natural salt out of the mud–and British law had been defied. At Dandi, thousands more followed his lead, and in the coastal cities of Bombay and Karachi, Indian nationalists led crowds of citizens in making salt. Civil disobedience broke out all across India, soon involving millions of Indians, and British authorities arrested more than 60,000 people. Gandhi himself was arrested on May 5, but the satyagraha continued without him.