Mamata Banerjee starts 'dharna' at police station after detention, says 'We were kidnapped'. Mamata Banerjee along with four MPs of her party has begun a 'dharna' (sit-in) at Dwarka North police station after being detained during protests in Delhi. "We were kidnapped and driven around in a prison van for two hours," she claimed. "I'm not returning to Kolkata tonight and in protest against all that's happening today against the youth," Mamata added.