As India is gearing up to celebrate New Years Eve tonight, the police of metro cities have issued a strict advisory for the citizens in order to spend their festive season safe and sound. Meanwhile, in Mumbai, an unknown caller threatened to bomb several places in the city amid New Year celebrations, urging a high alert in the city, said the Mumbai Police.On Saturday, the call was received at nearly 6 pm, at the Mumbai Police Control Room.As per the details, the caller claimed There would be explosions in Mumbai and cut the call.Briefing about the incident, a spokesperson for the police said that several checks were conducted following the call. However, nothing suspicious was found yet.The police were trying to trace the caller as soon as possible.Considering the New Year celebrations, the Mumbai Police have tightened security across the city.