Alleged screenshots of Thief 4 have leaked online.

The screenshots, which appeared on a Russian website GamesManiac earlier this afternoon (via NeoGAF), appear to show a caped lead character scaling walls and sneaking around a medieval city.

The site claims that Thief 4, simply titled 'Thief', will release on PC and next-generation consoles in 2014.

To take a look at the screens, head through to GamesManiac's website .

The game certainly looks like Thief to us, but Square won't confirm it.

A Square Enix representative told that it does "not comment on rumour or speculation" when asked whether the screens published on GamesManiac's site were of Thief 4.

Thief 4 is rumoured to be officially unveiled in the next issue of Game Informer.

Source: GamesManiac, NeoGAF