Four foreign tourists and two others were stabbed on Sunday in Zanzibar by a young man at a restaurant.
According to police spokesman Hassan Nassir Ali, the attacker stabbed the people and ran away in the evening when people were breaking their Ramadan fast into the Lukman restaurant in the capital Stone Town in semi-autonomous region of Tanzania.
The attacker was aged between 20 and 25, and it is suspected he had a mental disorder and was drug addict.
Tourism Minister Rashid Juma said an investigation need to be conducted to know whether the person had mental problem and also why he had targeted the foreign tourists.
The suspect is still at large and police confirms it not to be related to terrorism.
Eyewitness Omar Hassan said the suspect was armed with a knife and panic was caused in the restaurant after he attacked one local person and three foreign tourists.
Police said the injured included two German women, one Canadian man and a 66-year-old French woman.
The injured were admitted to hospitals and later were released.
In recent years the island has been under sectarian and political tensions and this has affected the tourism industry largely.
Tourism is the main foreign currency earner for the region as it is famed for white-sand beaches and historical buildings that has been listed into world heritage site by UNESCO.
A Catholic priest and two British tourists were doused with acid in 2013.
Zanzibar is a part of Tanzania but come not under complete control of it.