Syria's charge d'affaires, who was not named, allegedly wanted to abduct his daughter and take her out of Sweden where she was having a relationship with a young man, SVT reported, citing sources close to the matter.
The diplomat was allegedly helped by an elected Social Democrat politician who was arrested as part of an enquiry into the matter, television said.
Teo Zetterman at the Swedish foreign ministry was unable to confirm to The Local on Wednesday morning whether the diplomat was still in Sweden.
"We don't comment on these types of diplomatic cases at all," he said.
SVT reported that the diplomat had already left the country, while other media said he was still in Sweden.
The Social Democrat politician who has represented Stockholm for several years, was reported by SVT to have been acting as the Syrian diplomat's family adviser.
The politician is currently being detained and the prosecutor will decide on Wednesday whether he should be released.