In a statement here, Gandhi said several people including children had died in the violence, and "there was widespread destruction of public property and senseless attacks" on the media.
Gandhi, while appealing to the people to maintain peace, also spoke to Punjab Chief Minister Amarinder Singh and asked the government of Haryana and the Chandigarh administration to ensure the safety of all citizens.
At least 28 people were killed and 250 injured in widespread violence, arson and police firing triggered by the rape conviction of self-styled godman Gurmeet Ram Rahim Singh.
Police responded by opening fire.
The unrest which began in Panchkula where the verdict was handed down, spread to other parts of Haryana and Punjab and even New Delhi where a bus and train were set on fire.