Mumbai (Maharashtra) [India], December 31 (ANI): An anonymous caller on Saturday evening warned Mumbai Police of serial blasts in the city, officials informed on Sunday. “Mumbai Police Control received a threat call on Saturday evening, around 6. The caller claimed that there would be serial blasts in Mumbai before hanging up,” an official said on Sunday. The police swung into action and carried out searches at several key public places and installations across the city. However, no explosive devices or anything suspicious was found. “Police are currently trying to find out the details of the …