A bomb exploded at the home of a former village administrator appointed by the National League for Democracy at Zayat Hla village in Yekyi Township, Ayeyawady delta region, on 8 September.
U Myo Min Thein was wounded and his family members also injured in the incident.
An unidentified man on a motorbike gave a package to the administrator and immediately left.
U Myo Min Thein had already resigned from the post of village administrator after the military coup took place.
Junta forces accused him of testing a homemade bomb as they did not find any clues. He is now getting medical treatment and under arrest, according to the local sources.