Police discovered a cannabis factory containing about 350 plants in a property in Cavendish Place, Eastbourne.
Officers went to make some enquiries on Monday (1 April) at about 9.20am and could smell a strong odour of cannabis. They found cannabis plants growing in five rooms. A man at the property tried to escape up by climbing out of a window onto the roof but was later arrested on suspicion of producing cannabis.
The 21-year-old man was later released without charge and handed over to the immigration authorities.
Inspector Rachel Barrow said: "This was a substantial cannabis factory set up and our enquiries are ongoing to identify those involved. If anyone has any information about it, please contact us."
Contact police online or ring 101 quoting serial 0247 of 01/04 if you can help the investigation.