BMO systems partially restored after being shut down Friday morning

QMI Agency File

QMI Agency File

QMI Agency

, Last Updated: 1:44 PM ET

The Bank of Montreal said its services were partially restored early Friday afternoon, with customers able to access their accounts at ATMs through mobile, credit cards and points of sale, after a system-wide shutdown earlier in the day.

For several hours, customers were unable to use their debit and credit cards or ATMs. Online banking and telephone banking remained unavailable.

"We are experiencing technical difficulties with automated systems," the bank said on Twitter Friday morning.

BMO apologized and said staff continued to work on the problem.

The system went down around 10:30 a.m. ET.

Jason Wallace said he was at a restaurant Newmarket, Ont., with his family Friday morning when he tried to use his debit card and it was declined.

"This is our money we put into these banks. This is ours and I've got some transactions that have to take place today," said Wallace.

He said he went to the BMO branch and the tellers told him he could only withdraw $100. Calls to the bank went unanswered, he said.

He's not alone in his anger. Twitter has erupted with BMO complaints since the shutdown.

"Having every card I have declined when trying to buy a coffee is kind of embarrassing," tweeted Greg Beever from Edmonton Friday morning.

In Montreal, Emilie d'Anjou tweeted: "Just my luck. Finally received (my) iPhone 5 16GB, but now I can't pay because @BMO is down. Yay."