A 75-year-old Wheaton man was abducted at knifepoint Wednesday at a shopping center and forced to drive to several automated teller machines to withdraw cash, Montgomery County police said.

The man was leaving a Giant Food store at Westfield Wheaton shopping center in the 2900 block of University Boulevard when he was forced into his own four-door sedan about 2 p.m., said Capt. Marcus Jones, a police spokesman.

Over about two hours, the assailant ordered the man to drive to several ATM locations and withdraw money.

The robber eventually fled from the vehicle, leaving the victim unharmed, Jones said. The victim then drove to his home, where he called police.

Police were investigating how many ATMs were involved and how much money was stolen, Jones said. The victim was not familiar with many of the locations and was trying to help police trace their route, officials said.