Police are searching for a US tourist whose passport and other items have been found at a Marlborough marina.

Jason Michael Johns, 36, has been missing since last evening.

He is believed to have been at Waikawa Marina in Picton.

At about 1am, Marlborough Port Security located a number of items at the marina, including a backpack, sleeping bag, clothing and Johns’ passport.

A wet blanket was also found among the items.

Police reviewed CCTV footage from the marina and it appeared the items were left there about 10 last night.

But Mr Johns’ whereabouts are unknown.