Three men were pinned to the ground during what is understood to have been an armed police operation in Scunthorpe.
Four police cars, armed officers and dog units were spotted at the scene at around 7pm on Monday, August 5. It is understood arrests were made on Rowland Road near the former Queen Hotel, but this is not yet confirmed.
Photographs from the scene show men being restrained and pinned to the floor by police next to a silver car.
According to a Facebook post by Gi Scunthorpe News, one witness reportedly saw what was described as a large machete type knife on the floor.
Lincolnshire Reporter contacted Humberside Police for further information, but there was no reply by the time of publication.