Danish government sources say Prime Minister Helle Thorning-Schmidt is likely to call parliamentary elections on Wednesday.

The prime minister's office says she is expected to "make the announcement" during a news conference scheduled to begin at 11 a.m. (0900 GMT).

The Social-Democratic Party-led government's four-year term ends Sept. 14. The opposition center-right bloc, led by former Prime Minister Lars Loekke Rasmussen, has led in recent opinion polls.

Thorning-Schmidt — the Scandinavian country's first female prime minister — has been in office since the previous election in 2011. Her minority coalition has been able to stay in power with the support of former coalition member, the Social People's Party, and another small left-leaning group.