A park was cordoned off to protect the public after a suspicious bag was found by police.
Officers were carrying out an open land search of Alt Park and Woolfall Heath Meadow in Huyton when they made the discovery.
After finding a bag in the bushes around 10.40am today, police took no chances and cordoned off the area while they did further checks.
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But the contents of the bag, initially feared to be live grenades, turned out not to be paintball grenades.
The items were seized as well as a number of knives also found in undergrowth by police officers from the Huyton Community Team.
The cordon has now been lifted by police.
A Merseyside Police spokeswoman said: "During the search, officers located what appeared to be a bag of grenades hidden in the undergrowth. In order to maintain public safety, officers established a cordon until the items could be properly identified.
"The items turned out to be paintball grenades however, they still had the potential to cause injury or fear if in the wrong hands. The items have now been removed and the cordon stood down.
"During the search a number of knives were also located and seized."
Merseyside Police say open land searches are part of the force's "ongoing commitment to disrupt and deter those involved in crime and anti-social behaviour".
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Anyone who knows where weapons or drugs are being stored are asked by police to report it to them which can be done online via its website, social media channels, or via telephone on our non-emergency number 101.
Alternatively people can contact Crimestoppers anonymously on 0800 555 111.
