Paris- A man was arrested in Paris on Friday suspected of slitting the throats of his father and brother outside a building in the east of the French capital, police sources said.

Some witnesses said the suspect made remarks “linked to extremism.”

Police had sealed off a section of the street around the high-rise building in the city’s 11th district.

According to Britain’s Daily Express, the men were discovered with their throats slit outside the building on Rue de Montreuil near Place de la Nation.

Both men died at the scene as paramedics tried to save them, the newspaper quoted police sources as saying.

The attack came a day after an employee at the Paris offices of the International Monetary Fund suffered injuries to her hands and face after opening a letter which exploded, police said.

Several people were evacuated from the building near the Arc de Triomphe monument “as a precaution.”

Also Friday, a second person was being held over a shooting at a French school where a heavily armed teenager opened fire, slightly wounding three fellow pupils and a teacher, a judicial source said.

The suspect is a brother of a friend of the 16-year-old attacker, the source said, asking not to be identified by name. The friend is still being sought by police.

The shooter, who was described by investigators as unstable and obsessed with guns, surrendered to police after Thursday’s attack in the southeastern town of Grasse.

Armed with a rifle, two handguns and grenades he caused panic at Alexis de Tocqueville high school, firing several shots.