In France, a shooting at a school in the southern town of Grasse has injured two people today.
"I turned and saw someone in the yard with a shotgun firing", Alexis de Tocqueville student Benjamin, 16, told French newspaper Nice-Matin.
All schools in Grasse were locked down after the late-morning shooting, which led panicked students to flee the school and hide, local authorities said.
The terror warning was sent out through the French government's phone app.
The student, who has not been publicly identified, was arrested in possession of multiple weapons after the attack, the police official said.
A suspect is now on the run, French media have suggested it could well be an incident between two students.
Police cordoned off the area and anxious residents gathered outside, along with several emergency vehicles.
Here is what we know about the shooter and the incident that had France fearing it had been hit by another terror attack.
A shopkeeper opposite the school told Franceinfo he heard "several shots" and three schoolgirls had taken refuge inside his store. He shot in the air and then ran away.
The headmaster was reportedly among two people "lightly injured" in the attack.
"The individual does not seem to be known by police", one source said.
Local emergency services advised residents on Twitter to stay at home. Earlier in the day, a letter bomb had exploded at the headquarters of the International Monetary Fund in Paris.
During the attack, some students hid at the school and others were evacuated.
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