Four people, including the suspected assailant, have been arrested after a deadly stabbing in eastern France that authorities have linked to Islamic extremism. The suspect, a 37-year-old Algerian man, is described as an Islamic extremist with a schizophrenic profile. The attack resulted in the death of a Portuguese man and the injury of seven police officers. French President Emmanuel Macron has stated that the government is determined to respond to the attack, which he attributed to 'Islamist terrorism.' The French government will hold a special meeting to discuss immigration in light of the incident.