What thing led to violent clashes in many palaces?

Worried by the developments, the colonial government began arresting the Congress leaders one by one. This led to violent clashes in many palaces. When Abdul Ghaffar Khan, a devout disciple of Mahatma Gandhi, was arrested in April 1930, angry crowds demonstrated in the streets of Peshawar, facing armoured cars and police firing. Many were killed. A month later, when Mahatma Gandhi himself was arrested, industrial workers in Sholapur attacked police posts, municipal buildings, lawcourts and railway stations – all structures that symbolised British