Joshua Bishop was last seen in Lalor Crescent at about 9.30pm on Tuesday, May 27, by his housemate.

He was reported missing by his mother on May 29.

His behaviour is believed to be completely out of character, prompting concerns for Bishop’s welfare.

Today, police, along with mounted officers and SES volunteers, are searching Broadmeadows Valley Park on Barry Road.

His phone was last tracked to the park on May 27.

The park was previously searched by police on June 4.

Bishop’s phone and bank accounts have not been accessed, and he has made no contact with family and friends.

Police have not been able to rule out that his disappearance is suspicious and, while Bishop has never been reported missing before and is not known to police, detectives are investigating whether he has been involved in criminal activity.

Bishop is Caucasian and described as being of average build, with short blonde hair and blue eyes.

He was last seen wearing a black singlet and tracksuit pants.

Detectives are keen to speak to anyone who may have any information about Bishop’s disappearance, or who has seen him since 27 May.