German Chancellor Angela Merkel has said it is "too early to say exactly how we will proceed" in forming a government.
If her current coalition lacks a majority and her party cannot govern alone, the likeliest outcome is a Merkel-led alliance with the Social Democrats, the Associated Press reported.
The two are traditionally rivals, but governed Germany together in Merkel's first term after an inconclusive 2005 election.
"The ball is in Merkel's court," her center-left challenger, Peer Steinbruck, said. "She has to get herself a majority."
More top news
Murtaza Ahmadi's father said his family have moved to Pakistan after being bombarded with threatening phone call.
North Korea has banned all weddings, funerals and freedom of movement ahead of the first Worker's Party congress in 36 years.
She passed away three years after the unexpected death of her co-star on the reality dating show.