Ethiopian authorities have not yet given any reason for the arrest.
No charges have been brought either.
During questioning with Kumerra, police, according to his lawyer, have accused him of spreading false information and of having communicated with anti-government forces.
"Must be able to cover news"
Kumerra has worked as a photographer and journalist for the news agency Reuters for over ten years.
He has also had assignments for SVT, including when the Swedish journalists Martin Schibbye and Johan Persson were arrested in Ethiopia.
"We are very pleased that Kumerra has been released and has been able to be reunited with his family," Reuters news director Stephen J. Adler said in a statement.
- Journalists like Kumerra must be allowed to cover news that is in the public interest without having to be afraid of harassment.
Have prepared a feast
Kumerra's family tells Reuters that they are very happy that he is coming home just in time for the Ethiopian Christmas celebration on January 7.
- We want to thank everyone who has helped us through this difficult time, the family says in a statement to the news agency.
They also say they have prepared a feast for Kumerra's return home.
Is getting worse
Since Abiy Ahmed took office as Ethiopia's Prime Minister three years ago, major changes have taken place to improve press freedom and dozens of journalists have been released from prison.
But now press freedom organizations warn that the situation is once again getting worse.
Since the conflicts in the Tigray region escalated in November last year, seven journalists have been arrested.