A regional police spokeswoman said the victims in the attacks yesterday were a Chinese person, a Moroccan, a Pakistani, a Spaniard and a person from an unspecified South American country.
The aggressor left the knife stuck in the back of the last victim.
The officer said the perpetrator appeared to attack his victims at random without any apparent motive. She said police believe he may be a foreigner.
One of the five victims is in critical condition while the other four have serious wounds.