Police discovered a man in his 20s with gunshot wounds near the Al-Ghazali school in the Arab town of Tira.
Paramedics treated the man on site and then rushed him to the Meir Medical Center, where he was listed in serious condition.
Magen David Adom said the man's condition was highly unstable due to gunshot wounds he sustained in the upper half of his body.
Earlier on Wednesday a fire fight between police and gunmen broke out in the Arab village of Taiba, which, like Tira, is located in a cluster of Arab towns and villages called the Triangle. One person was killed during the ensuing gun battle.