The London police canine unit played a key role in the arrest of six people after back-to-back bank robberies.

Investigators believe two men robbed two TD Canada Trust branches Wednesday evening, the latest in a string of robberies at pharmacies and a jewelry store that has been hit twice.

Nearly 40 minutes after the second robbery, police found a suspect vehicle in the area of Emerson Avenue that runs parallel to Adelaide Street south of Thompson Road.

The canine unit tracked down two men, who were arrested, police said. Three men and a woman were later arrested at a home on Emerson Avenue.

Police did not identify the people who were arrested or release information about charges. A police spokesperson said the investigation is continuing.

Early Thursday morning, 10 hours after the arrests, more than a dozen police vehicles and officers with assault rifles were at the home on Emerson Avenue where four suspects were arrested.

Police blocked off Emerson and Helena avenues and seized two vehicles.

The first robbery occurred at 7:15 p.m. when two men entered the TD-Canada Trust branch at 1055 Wonderland Rd. N. The suspects were armed with a weapon and demanded money, police said. The type of weapon wasn’t specified.

The suspects left in a vehicle after they were given an undisclosed amount of cash.

A half hour later, two men armed with a weapon demanded money at the TD Canada Trust branch at 1420 Ernest Ave.. They left in a vehicle with an undisclosed amount, police said.

“They appeared to be the same two suspects,” Const. Sandasha Bough, a spokesperson for London police, said Thursday.

No one was injured in the robberies, police said.

With files from Free Press Reporter Jennifer O’Brien.

hdaniszewski@postmedia.com

Jlobrien@postmedia.com