The fire-struck university has about 10,000 foreign students

Saturday's violence came five days after a hostel fire on the same campus killed at least 38 students.

Six students are in hospital with serious injuries following the attack near another hostel on the site.

Police say security has been stepped up at the university, which admits students from developing countries.

Correspondents say foreign students in Moscow have often been the victims of racist violence in recent years.

After Saturday's attack police detained nine men.

On Sunday two were charged with hooliganism - the others were released.

The students wounded include five Jamaicans and a Columbian - two are girls.

No alarm

The attack came as investigations continued into the cause of the blaze that broke out early last Monday in a dormitory at the People's Friendship University, formerly known as Patrice Lumumba University.

Officials say the number of dead from the pre-dawn fire has risen to 38 with about 160 students still receiving hospital treatment.

The dead include nine Chinese, an Ecuadorean, a Sri Lankan, a Vietnamese and a student from Guinea-Bissau.

The fire was initially blamed on arsonists, but the Russian authorities now believe faulty electrical equipment was to blame.

Investigators have already discovered that the hostel building lacked an alarm system and an evacuation plan.