The CPI-M state secretariat had demanded a detailed probe into the incident, saying in a statement that the incident should not be taken lightly by portraying the person involved as mentally imbalanced.
CPI-M claim the incident was an attempt on Vijayan's life.
Home Minister Thiruvanchoor Radhakrishnan has given instructions to hand over the probe to the Crime Branch, the sources said.
The man, identified as one Kunhikrishnan Nambiar from Valayam in Kozhikode district, was arrested after local people informed them that he was moving near Vijayan's house in a suspicious manner on Thursday.
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