Manipulated videos are taking center stage as campaigning heats up in India's election, with fake clips involving two top aides of Prime Minister Narendra Modi triggering police investigations and the arrest of some workers of his rival Congress party.

In what has been dubbed as India's first AI election, Modi said last week fake voices were being used to purportedly show leaders making "statements that we have never even thought of," calling it a conspiracy "to create tension in society."

Indian police — already investigating the spread of fake videos showing Bollywood actors criticizing Modi — are now investigating a doctored online clip that showed federal home minister Amit Shah saying the ruling Bharatiya Janata Party will stop certain social guarantees for minorities, a subject sensitive for millions of voters.