Stockholm - Two men were arrested Wednesday on suspicion of involvement in a daring heist at a cash depot on the outskirts of Stockholm last month.

Thieves used a stolen helicopter and explosives to raid the G4S cash depot in the Stockholm suburb of Vastberga, entering the building via a roof window.

Three other men have been in custody since last month including a 34-year-old man alleged to have flown the helicopter that was found abandoned in a field several hours after the September
23 raid.

G4S has offered a reward of 1 million dollars for information leading to any arrests but has not disclosed the value of the stolen cash.

Two other men have earlier been released after custody hearings.

Police have said at least 10 people took part in the heist.(dpa)