A party being held on a field in St Helens was shut down by police this weekend.
Officers turned up at King George V fields, in Haydock, on Saturday evening after reports of a 'mini-rave' involving youths.
Police said those involved 'fled the scene' when officers arrived at the gathering which broke coronavirus lockdown rules.
The field was said to have been left in a "disgusting state".
Cans of alcohol were left by the group after they fled and many used canisters of nitrous oxide known as "hippy crack" or "laughing gas" were also discovered.
The following day after the rave, on June 13, two men were arrested, in St Helens, after a large haul of nitrous oxide was seized by officers.
It followed a stop check of a vehicle on Ainsworth Road, in the area of Denton's Green.
About 600 canisters were found and the men, both 24, of Huyton and Haydock, were arrested and quizzed on suspicion of intent to supply the drug.
It is unclear if there is a connection between the arrests and the illegal rave.
Community Inspector Matt Drennan said: “We take such reports extremely seriously and our investigation is ongoing.
"Although known as laughing gas, nitrous oxide is far from being a laughing matter. It can cause serious health risks, including severe headaches, dizziness, paranoia, frostbite, and death.
"The longer-term risks are still being understood, so we’d strongly urge people not to be so reckless as to take these or any controlled substances."
