Detectives probing the murder of a teacher by unknown assailants after withdrawing Sh285,000 from a bank in Mumias town have narrowed their investigations to two bank tellers.

The Standard has established that the two bank employees who served the slain Roseylda Akinyi are persons of interest, even as they pursue two other suspects who were captured through the bank's CCTV cameras.

This comes as it emerged that the deceased was stabbed with a knife and not shot by a gun as earlier reported by authorities.

Last week, Akinyi was waylaid by a group of thugs in a saloon car, moments after she had withdrawn money from the bank.