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The assailant, Lestin of Keechery Koola House, surrendered to the police immediately after the incident.
The senior doctor, who already has an underlying heart condition, is currently admitted to ICU.
Navas was stabbed when he went to confront the assailants who attacked his brother.
The deceased, Adam Joseph (30), is a native of Thattarambalam in Mavelikara.
Three people were killed and eight others were injured in the attack.
The regional police force Mossos d'Esquadra said three people had been arrested for attempted murder.
The suspect, a 17-year-old male, is in police custody.
A classmate of the accused alleged that the teacher had reprimanded the student earlier in the day.
The assailant was shot by a police officer in the city of Mannheim.
The deceased has been identified as Benoy Stanley.
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