MEXICO CITY (AP) - Police have found an unusual indoor operation for opium poppy cultivation at a warehouse in the northern Mexico border state of Chihuahua.
The warehouse was equipped with special lighting and fertilizer.
The state prosecutors' office said Monday that 2,400 small plants were found.
The operation may have been preparing poppy seedlings to be transplanted outdoors later.
A trailer found at the scene was equipped to carry the seedlings and had a sign for a hydroponic animal feed company.
Illegal opium poppy growing has increased in Mexico in recent years, but the fields are almost always located outdoors in remote rural areas.
The Sunday raid started after police detained a man carrying a bag of poppy seeds.