* Swedish centre-left PM loses confidence vote
* Neither political bloc has majority, politics deadlocked
STOCKHOLM, Sept 25 (Reuters) - Swedish Prime Minister Stefan Lofven lost a mandatory confidence vote in parliament on Tuesday meaning he will step down, but with neither major political bloc holding a majority it remained unclear who will form the next government.
Voters delivered a hung parliament in the Sept. 9 election with Lofven's centre-left bloc garnering 144 seats, one more than the centre-right opposition Alliance.
Analysts expect the speaker to pick Ulf Kristersson, leader of the Moderate Party - the biggest Alliance party - to try to form a new government.
Stefan Lofven's Social Democrats have ruled out backing an Alliance government.
Sweden Democrat leader Jimmie Akesson repeated on Tuesday his party would bring down any government that does not give it a say on immigration, healthcare, pensions and crime policy.
"If Ulf Kristersson wants to be prime minister it can only happen with my help," Sweden Democrat leader Jimmie Akesson told Swedish television on Tuesday.
The Alliance of the Moderates, Centre, Liberal and Christian Democrats has said it will not negotiate with them.
With a new vote unlikely to change the situation much, some kind of compromise is likely to be thrashed out.
A number of party combinations have been suggested, but all would have a heavy political cost and a deal is could take weeks.
Lofven will lead a transition government until a new administration is installed. (Reporting by Stockholm Newsroom; Editing by Alison Williams)
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