MOSCOW, April 20 (RIA Novosti) - Seven migrant workers are in hospital after being attacked on Monday morning at a building site in west Moscow, a local police source said.

"They were hospitalized with various wounds, including five people with gunshot wounds and one with a knife wound," the spokesman said, adding that 15 migrant workers were employed at the site.

The source said at least 20 people, some of whom carried firearms, stormed onto the site and attacked the migrant workers from Tajikistan and Uzbekistan at around 07:00 a.m. Moscow time (04:00 GMT).

Police have made no comment on whether the incident was racially motivated.

Last week a Tajik national, who was employed on a construction site, was killed in an apparently racially motivated assault in the north of the Russian capital.

The attack comes just hours after Russia's Interior Ministry said it was taking steps to prevent neo-Nazi demonstrations, expected to be held on April 20, the birthday of Adolf Hitler.

Attacks on foreigners and ethnic minorities are a regular occurrence in Moscow and St. Petersburg, as well as other Russian cities.

According to the Russian non-governmental organization SOVA, at least 68 people died and 262 were injured in racially motivated attacks in the country in the first eight months of 2008.