Indian police on Saturday arrested the son of a junior minister in Prime Minister Narendra Modi’s government as a suspect days after nine people were killed in a deadly escalation of yearlong demonstrations by tens of thousands of farmers against contentious agriculture laws in northern India, a police officer said.Four farmers died Sunday when a car owned by Junior Home Minister Ajay Mishra ran over a group of protesting farmers in Lakhimpur Kheri, a town in Uttar Pradesh state, officials and farm leaders said.Farm leaders alleged that Mishra’s son was in the car when it ran over the protesters, but Mishra denied it.