WINONA, Minn. – Police stepped up their manhunt in the investigation of a brutal assault on a woman in the rural Arches neighborhood near Lewiston two nights ago. Sheriff Ron Ganrude said there is probable cause to make an arrest. “We know who he is,” Ganrude said, but added he was also seeking a warrant. There is no reason to suspect the assailant poses a public danger, the sheriff said. The woman told investigators it was a case of infatuation. She said that she had told the man to leave her alone but he persisted after her. Ganrude said some deputies were familiar with the man and went make an arrest at the place where he was thought to be staying. He wasn’t there. Meanwhile, the woman continued in recovery from heavy blows to the back of her head.