Danish police said on Wednesday they were investigating two explosions in the immediate vicinity of Israel's Copenhagen embassy and had detained three people for questioning.
Two were apprehended on a train at Copenhagen's main railway station while the third person was detained elsewhere in the Danish capital, police said on social media platform X.
It was not immediately clear how those held by police were linked to the blasts.
There were no injuries in the explosions, which happened at around 3:20 a.m. local time (0120 GMT), and no damage to the building itself, the Israeli embassy said in a statement.
"It is clear that the Israeli embassy is in the immediate vicinity and that is naturally also an angle that we look at," Deputy Assistant Commissioner Jakob Hansen of the Copenhagen police told reporters.
An area was cordoned off around the embassy and armed Danish military personnel stood guard, while investigators wearing coverall suits were seen combing the scene for evidence.
Police were due to hold a press conference at 1200 GMT.
The blasts occurred against a backdrop of soaring tensions in the Middle East as Iran carried out a massive missile attack on Israel.
Israel, which is fighting Iran-backed Hezbollah in Lebanon, promised to retaliate, stoking fears of a wider war.
Carolineskolen, a Jewish school located near the embassy in the Danish capital, would stay closed on Wednesday due to its proximity to the crime scene, a spokesperson for the Jewish Community in Denmark told Reuters.
There have also been several recent security incidents near Israel's embassy in neighbouring Sweden, where police on Tuesday said they were investigating suspected gunfire in the area.
In January, a Stockholm police bomb squad disarmed what investigators called a "dangerous object" outside the Israeli embassy building.
The incidents in Sweden caused no injuries or significant damage.
Swedish authorities have said security police averted several planned attacks linked to Iranian security services using local criminal networks. Iran has called the Swedish report "baseless".
—Reuters