A woman was allegedly gang raped at gunpoint in front of her toddler son in West Bengal's North 24 Parganas district.Three people have been arrested in this connection, police said on Friday.The incident happened under Madhayamgram police station area on Wednesday night."Pointing a gun at the victim, the miscreants raped the woman in front of her three-year-old child," additional superintendent of police Bhaskar Mukherjee said."On the basis of her complaint, we arrested three people on Thursday night," added the officer.