A missing 10-year-old boy was dragged to safety from a Crosby marine lake.
Two plainclothes officers waded into the water fully clothed to rescue the boy when they realised he was in trouble.
The boy, who is from Ormskirk, had been at Crosby marina with his mum, 11 year-old brother and eight year-old sister yesterday afternoon (Thursday, 13 August)
He had gone to get changed out of his swimwear in the sand dunes after spending time playing in the lake when he went missing.
His family searched the surrounding area before contacting police.
An extensive search involving Merseyside Police, the Coastguard and the Port Police was carried out around Crosby beach, the marine lake and surrounding areas over a 90 minute period.
The boy, who has complex needs, was eventually spotted in the middle of the marine lake.
PCs John Liauw-Jen-Choy, and Rebecca Morgan-Richardson, who were on plainclothes patrol in the area, entered the water fully-clothed when they realised the boy was in trouble and were able to rescue him.
The boy was then reunited with his family.
His mum said: "We had been told to wait by our car while the police searched for him. They kept ringing to say they had had sightings of him then we heard the news he had headed back to the lake and had been spotted in the middle of the water.
"It was a massive relief when we were told they had him. He doesn't know the area and has no concept of how far away from home we were.
"The longer it went on the more worried I had become. He isn't a strong swimmer. He was a bit upset afterwards but is absolutely fine now.
"The officers were very reassuring and everyone was very kind. I couldn't have asked for anything more."
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Both the PCs who came to the rescue are based at Marsh Lane in Bootle.
Sefton Inspector Dave Uren said: "It was credit to John and Rebecca that as soon as they realised what the problem was they went straight into the water to get to the boy and bring him to safety.
"I am delighted that my officers were able to help in this situation and that it had a happy ending."
Simon Pendlebury, development manager at Crosby Lakeside Adventure centre said: “Although picturesque Crosby Marine lake should not be used for bathing due to the potential dangers.
"The adventure centre offers a number of safe and family fun ways to enjoy the water all under the supervision of experienced and fully trained individuals.”