(CNN) -- Sixteen people were wounded and a guru was shot to death in an outbreak of violence between rival Sikhs at an Indian temple in Vienna, Austria, police said.



Austrian police secure the area outside a Sikh temple in Vienna where a shooting occured Sunday.



Six people were arrested in connection with the incident, which occurred about 1:20 p.m. local time (7:20 a.m. ET) Sunday in Vienna's 15th district, police spokesman Schwaig Hofar told CNN.



One armed suspect fired at two gurus, and five other knife-wielding suspects attacked congregants during prayer, Hofar said. One of the gurus, a 57-year-old Sikh preacher, was killed.



The number of wounded includes four of the suspects, two of them in serious condition, he said.



About 150 people were in the room when the violence took place, he said. Authorities are investigating what triggered the attacks.



CNN's David Ariosto contributed to this report.
How many suspects attacked with knives? What did they use to attack? What were the suspects firing at? What number of people were in the room? What age was the Sikh preacher who was killed? What number of people were in the room when shoootings took place?
five knife-wielding two gurus, About 150 57-year-old 150
question: How many suspects attacked with knives?, answer: five | question: What did they use to attack?, answer: knife-wielding | question: What were the suspects firing at?, answer: two gurus, | question: What number of people were in the room?, answer: About 150 | question: What age was the Sikh preacher who was killed?, answer: 57-year-old | question: What number of people were in the room when shoootings took place?, answer: 150