BJP took aim at Congress after the same security researcher highlighted the WithINC app was transmitting personal data of those that signed up in an unsecured format.
A social media furore over data privacy on political party apps in India escalated on Monday with the ruling Bharatiya Janata Party (BJP) and opposition Indian National Congress (INC) trading barbs.
Allegations that Prime Minister Narendra Modi's official mobile app was sending personal user data to a third party without consent caused an online uproar over the weekend.
PM Modi's ruling Bharatiya Janata Party denied the allegations and said the data was being used only for analytics to offer the "most contextual content".
The BJP in turn took aim at the Congress on Monday after the same security researcher highlighted that the opposition party's app - WithINC - was transmitting personal data of those that signed up in an unsecured format.
The Congress later appeared to have deleted the link to its app entirely on Monday, prompting Amit Malviya, the head of the BJP's IT cell, to tweet, "What is the Congress party trying to hide?"
The Congress responded on Twitter saying it was forced to remove the app as an incorrect link was being circulated and people were being misled.
The security researcher, who has previously highlighted some vulnerabilities in India's national identity card project and who tweets under the pseudonym Elliot Alderson, caused a flurry on Saturday with a series of tweets saying the Modi app was sending personal user data to a third-party domain that was traced to an American company.
"Hi! My name is Narendra Modi. I am India's Prime Minister. When you sign up for my official App, I give all your data to my friends in American companies," wrote opposition Congress Party Chief Rahul Gandhi in a Twitter message on Sunday.
The BJP responded on Twitter, saying Gandhi was trying to divert attention. The BJP has accused the Congress of engaging Cambridge Analytica in India, a charge the opposition party has denied.
Reuters could not independently verify Alderson's claims.
PM Modi has not commented on the issue.
© Thomson Reuters 2018