What happened?
The main opposition Congress party has named its candidates for six out of seven parliamentary seats in Delhi, ending the possibility of a coalition with the Aam Aadmi Party (AAP).
The AAP, which is the ruling party in the Delhi legislative assembly, and the Congress had earlier talked about forming an alliance to fight Prime Minister Narendra Modi's Bharatiya Janata Party (BJP).
But with the Congress going ahead with its list, we will now see a three-cornered contest in Delhi.
The Congress has named former Delhi chief minister, Sheila Dikshit, as its candidate for the North East Delhi seat.
Why is this important?
The AAP and the Congress both oppose the BJP, and analysts say a coalition would have avoided the splitting of opposition votes in Delhi.
But both parties couldn't agree to a seat sharing agreement.
The first signs that their talks were failing came when Congress President Rahul Gandhi accused Delhi Chief Minister Arvind Kejriwal of making a U-turn in a tweet on 15 April.
In response, Mr Kejriwal had tweeted: "What U-Turn? The talks were still on. Your tweet shows that having an alliance is not your wish. I am saddened by your comment. Today it is important to save the country from the threat of Modi-Shah [BJP chief Amit Shah]. It is unfortunate that in UP [Uttar Pradesh state] and other states you are helping Modi by splitting the anti-Modi vote."
AAP is yet announce its candidates.