We are actively participating in local activities.

He is from a tribe in Africa.

He is studying about the uncontacted tribes in the Amazon.

It is very dangerous if the battery causes thermal runaway.

The government is building a nationwide surveillance network.

The patrol boat is patrolling the sea area.

He always watches over us as our guardian.

I went to the police station yesterday.

Police dogs are very effective in tracking criminals.

He was terrified of living in a police state.