The police had nabbed four persons yesterday. The fifth man was apprehended today and a motorcycle was seized.
The five were being interrogated, police sources said.
Seven motorcycle borne youths had fired upon the president of Saniyadi village panchayat, Mokibur Ali and secretary Mojinur Ali at Agiathuri area after they had withdrawn Rs 2.60 lakh from a bank and were on way to Guwahati yesterday.
The miscreants had also decamped with the money.
The two critically injured were admitted to the Gauhati Medical College Hospital.
A massive search operation was launched to nab the miscreants, the police said.