Serbia's interior minister said Wednesday that two Pablo Picasso paintings owned by a German museum and stolen from a Swiss exhibition have been found in Belgrade.

Ivica Dacic provided no information on the exact location of the paintings or possible suspects in the theft.

German police officers in the northern city of Hanover are using Facebook to catch criminals in an experiment that might be expanded to other forces in the country.

Six months' ago the Hanover police force set up a Facebook account with appeals to the public to come forward to help solve cases.