On Monday, the girl's family claimed they received a ransom call demanding Rs 5 lakh.
According to the girl's mother Shenaz, Sahana Rymbai of Nongmyngsong went missing on June 29, immediately after reaching Bangalore from Guwahati to meet her online male friend, who had introduced himself as Samir Gafur.
Despite repeated calls by her mother to Sahana's number, she remained incommunicado for two days. Later, she briefly came online to inform her mother that she was with Samir. When her mother called again on her daughter's number, an anonymous person demanded Rs 5 lakh for her release.
"While the male voice initially asked Sahana's family to deposit Rs 5 lakh in an account of Karnataka Grameena Bank, they were later asked to come to BIA," said Agnes Kharshiing, president of Civil Society Women's Organization.
Samir, while chatting with Sahana, had claimed to run several businesses in Bangalore and had invited her to the city, a police official investigating the case said.
Meghalaya police are coordinating with their Bangalore counterparts to trace the missing girl. "We don't have complete information. Once they come here, we will cooperate with them to trace the girl," a senior police official said.