While Parul, aged 7, was kidnapped on May 4, five-year-old Divya was abducted allegedly by an unidentified person on may 20.
The police had already announced a cash reward of Rs 25,000 for information about Parul and it has now been enhanced, an official spokesperson said.
Police have also released sketches of the accused suspected to be involved in Divya's abduction, and raids are being conducted to nab him, he said.