Saskatoon’s transit union says Monday’s contract talks between the city and the union are over, with the two sides again failing to reach an agreement.

The Amalgamated Transit Union Local 615, which represents the city’s transit workers, sent a tweet late Monday morning stating an agreement had not been reached and that no more talks were scheduled.

“As a result of the recent talks we do not have a tentative agreement, no scheduled talks,” the tweet read.

The union issued a 48-hour strike notice Friday, stating job action could begin as early as Sunday at 5 p.m.

The deadline passed with buses still running Monday morning, but the immediate future of the city’s transit services is now up in the air if the most recent talks have failed. The union’s 48-hour notice did not clarify what the strike could consist of.

City officials say the two sides have reached an agreement on wages but still continue to fight over a proposed pension deal. Eight of nine city unions — all except the transit union — have so far signed on to the pension plan, according to the city.

The city is still open to negotiating, officials say.

Transit workers in Saskatoon have been without a contract for four years. In 2014, bus drivers were locked out by the city for about a month after contract talks failed.