Two motorists were injured by rocks thrown at their vehicles on Haifa's Hagana Street on Sunday night.
In the first attack, a 17-year-old sustained light head injuries when a rock was thrown at his car. In the second incident, a 40-year-old was wounded in his hand by a rock thrown at his car on the same street.
Police sealed off the street to traffic until the end of Yom Kippur, and have launched a search for the youths behind the attacks.
A third rock-throwing attack was reported at Tzabar Junction at the entrance to Kiryat Motzkin, in which an Israel Electric Corporation vehicle was damaged.