Police said yesterday they had traced most of the 2.8 million euros taken in Friday’s Thessaloniki bank holdup by a four-member gang of robbers, including an off-duty police officer. Authorities managed to locate 2.4 million euros of the stolen cash, which had been stashed away in barns, watering containers and portable coolers placed in village homes outside Thessaloniki. Police yesterday arrested the last of the four male suspects, aged 28, who turned himself in to authorities after being on the run since Friday. Another two men, aged 57 and 45, were arrested on Saturday. Making up the quartet was a 45-year-old employee at the Alpha Bank cash distribution center where the heist took place. The first arrest was made on Friday when the off-duty police officer was caught escaping the scene by a security guard.