(KTRS) – Voters in St. Louis County may get more time to cast a vote in Tuesday’s elections.

The problems started earlier today when a few polling places reported shortages. The shortages expanded to include dozens of locations throughout the county. By Tuesday afternoon, election officials said that they are formally asking to extend voting hours until 9 p.m.

The issues could be partly influenced by the fact that touch-screen voting machines were not available for this election, forcing officials to use only the optical scan ballots. Elections Director Eric Fey said there was not enough time to collect and reprogram the touch-screen devices after last month’s presidential primary.

Missouri Secretary of State Jason Kander announced that his office plans to investigate why some locations ran out of ballots.