One of the suspects is a former Brinks employee who had recently been fired. The robbery was one of five similar crimes in the area in less than two months.

Police are investigating whether the armed robbery of a Brinks truck on Tuesday outside a Philadelphia-area store is related to four other attacks on armored vehicles in and around the city this summer.

Three men were arrested for stealing more than $2 million from a Brinks truck outside a Home Depot in Philadelphia in June.