A manhunt was launched last night by police after three masked men attacked security guards with screwdrivers.
A car suspected to have been used in the crime was found in the Alltami area of Mold and will be examined by forensics.
Officers scrambled the force helicopter and unleashed sniffer dogs after the attempted robbery yesterday.
The gang targeted two guards stocking a cash machine at the Shell garage in Chester Road, New Brighton.
The incident took place just after 2.30pm - after a struggle, the men fled empty-handed.
Last night, investigators said the men escaped on foot but are believed to have dumped a silver Mercedes car.
A North Wales Police spokeswoman said the security staff were left with minor injuries.
She said: "As one of the security staff left the vehicle and entered an area within the garage to re-stock the cash machine three masked offenders attacked him with screw drivers. A struggle took place, their attempts failed and they left the area on foot."
DCI Neill Anderson said: "This is a busy garage on a main thoroughfare and undoubtedly some members of the public would have witnessed the activity. I am urging those individuals to come forward."
ANYONE with information should call police on 0845 607 1001 (Welsh), 0845 607 1002 (English) or Crimestoppers anonymously on 0800 555 111.