Police raided a Lincoln flat and arrested two people suspected of supplying drugs.
It comes just a week after armed officers stormed a flat in Raglan House off Ruston Way in connection with a gun alert.
Eyewitnesses saw police searching a first floor flat on Tuesday morning after a man in his 50s and woman in her 20s were arrested.
Both remain in police custody.
Late on July 4 police also arrested three people after a firearm was used to threaten someone.
A man in his 20s, a woman in her 30s and a man in his 40s were all arrested.