The police are particularly worried after the disappearance, Wednesday, of a teenager in the area of Villennes-sur-Seine (Yvelines).
They have just broadcast a call for witnesses * to find the young Anaïs, 14 years old.
The teenager left his father's home, located in the Renardières district, leaving a letter specifying his runaway.
Anaïs, 1.70 m tall and of strong build, has brown hair with blond tips and brown eyes.
She left without a phone or transit card and is reportedly wearing a black t-shirt and jogging pants.
The last worrying disappearance reported in the Yvelines dates back to the end of June, near Chesnay-Rocquencourt.
Maurice, 83, had left the Ephad room in the city center where he lives for no reason, before being found safe and sound three days later.
* Anyone with information can dial 0178731111.