11/06/2014 06:04 EST | Updated 01/06/2015 05:59 EST

Most-wanted holdup suspects sought by Toronto police

Four armed robbery suspects — some of whom have eluded police for years — are the focus of renewed effort by Toronto's holdup squad, which on Thursday released a list of its most wanted criminals. 

They are the serial bank robber known as the "Vaulter Bandit," a pair of thieves who robbed a jewelry store earlier this year, and the suspect who shot a TTC fare collector in 2012. 

The "TTC Bandit" topped the holdup squad's most wanted list. He or she — there is debate on that point — shot and wounded a collector at Dupont station after he refused to hand over any money. 

"There are people out there, upon looking at photos and video, that believe [the suspect] could be a female. There's other people that think it could be a male," said Staff Insp. Mike Earl of the Toronto Police Service. 

Police believe the TTC Bandit robbed the same station twice in the eight months before the shooting. There is a $25,000 reward in the case. 

​​The Vaulter Bandit — so named because he leaps over bank counters and grabs cash from the till — is wanted by police across the country for a nearly five-year crime spree involving 18 bank robberies, in York Region, Hamilton, Mississauga, Calgary and Ottawa. His most recent robbery was his first in Toronto. 

"Our concern is he may be getting ready to hit again and we have no idea where," Earl told CBC News. The reward for the Vaulter Bandit is up to $50,000. 

​Police are also looking for the two masked men who robbed the Jewellery By Isaac store on Yonge Street near Eglinton Avenue in May. 

They came in "screaming and pushing and man-handling the victims," Earl said, "and then immediately smashing the display cases with the butt of a shotgun." They made off with $25,000 worth of in jewelry. 

"I would call it a very terrifying experience."

The whole scene was caught on video and police also caught images of the pair prior to the robbery while they were pretending to talk on phones outside the store. Police think this pair could be responsible for other holdups. 

Anyone with information on any of these cases can contact the holdup squad at 416-808-7350 or Crime Stoppers at 1-800-222-TIPS.