Pretoria - The City of Tshwane on Tuesday said efforts were under way to put the brakes on a metro bus strike affecting scores of commuters. Spokesperson Lindela Mashigo said the strike, which was being carried out by bus drivers affiliated to the SA Municipal Workers Union (Samwu), began on Monday."The management of the Tshwane Bus Service is holding talks with union representatives with the view of finding each other and resolving the matter," said Mashigo."Their [the drivers'] gripe is about the revised shift schedule," he said. With the Samwu-affiliated drivers on strike, routes were being serviced by skeleton staff. The City on Monday tweeted: "Tshwane Bus Service (TBS) management was taken by surprise when Samwu affiliated drivers abandoned shifts this morning".The Democratic Alliance on Tuesday issued a statement calling for the matter to be speedily resolved."What is also contributing to anger among commuters is the lack of communication when there are strikes," said DA councillor Francois Bekker. If commuters are warned in advance, and given an indication of when services will resume, they will be able to make alternative arrangements, Bekker said.