Kozhikode (Kerala) | A woman passenger suffered serious injuries after unidentified persons pelted stones at the Kannur Executive Express here, police said on Tuesday.

The injured was identified as Aiswarya Ramakrishnan (22) of Vadakara, who lost three teeth and sustained injuries to her lips and chin.

According to police, the incident occurred between Kadalundi and Feroke railway stations on the Executive Express operating between Alappuzha and Kannur at around 9.50 pm on Monday.

Police said co-passengers alerted railway authorities, who then shifted Ramakrishnan to a hospital.

The Kozhikode Railway Police have registered a case and started an investigation.

Police said Ramakrishnan, a college student, was returning home on study leave and was seated by the window in an unreserved compartment.

The Railway Protection Force (RPF) has also launched a parallel probe and is trying to trace those behind the incident.