Police are appealing for witnesses following reports of buses being damaged in Hastings between 11 and 16 January.
On 11 January, a window was damaged on a number 98 bus on Mount Road, suspected to have been caused by a stone.
On 12 January, a window was damaged whilst the bus was approaching a stop on Stonehouse Drive at around 7.20pm.
On 16 January, an item was thrown at the window of a number 20 bus on Harold Road at around 6.30pm, causing the window to shatter.
There were no injuries reported.
Officers are investigating and carrying out CCTV enquiries.