According to local media, the as yet unknown perpetrator has barricaded himself at the scene.
The police have sent an elite force to the scene.
More was the minister responsible for issues of the environment and natural resources.
Also be a lawyer
"We are saddened by what has happened," Mera's ministry wrote in a brief statement.
Mera has been a minister in the government since August 2020. In addition to his government assignment, Mera was also a lawyer.