New Delhi, Feb 7 (IANS): Delhi Police Tuesday claimed to have traced the sister of battered baby Falak, who is fighting for survival at All India Institute of Medical Science (AIIMS), in Bihar.

"Falak's sister was found in Muzaffarpur in Bihar yesterday (Monday). The team which was sent to Bihar traced the three-and-a-half-year-old girl and she will be brought to Delhi today (Tuesday)," a senior police officer told IANS.

According to police, they tracked down the three-and-a-half sister of Falak after a detailed interrogation of Laxmi, who allegedly tricked Munni, who claims to be their mother, into a second marriage.

A day earlier, police said they had found 22-year-old woman Munni in Jhunjhunu district of Rajasthan and brought her to Delhi Sunday night. Munni - who is also being treated as a victim in the case - claims to have abandoned Falak in September last year.

Police also said that Munni has three children - a five-year-old boy, a three-and-a-half-year-old daughter and Falak - from her first husband. She got married in 2006 when she was barely 16 years old.

Tracing the three-year-old, police are on the lookout for the elder son of Munni. "We are now looking for the elder son of Munni," the official added.

Meanwhile, Falak is still critical and fighting for life at AIIMS.

"Falak is still critical, there has been no major decline or significant improvement in her condition. We are continuously administering antibiotics and waiting for the culture report," Deepak Agrawal, assistant professor, neurosurgery, at the AIIMS Trauma Centre, told IANS.

Falak, who is two years old, was admitted to AIIMS Jan 18 with severe head injuries and bite marks all over her face. She was brought by a 14-year-old girl who is now in a juvenile home.

Police are probing the human trafficking and prostitution angle in the case. A total of six people have been arrested so far.