Question: How many participants did the person who shot Adrian Pracon kill at a summer camp?

Context articles: Camp Deer Run
Camp TA-RI-GO
Camp Ralph S. Mason
Adrian Pracon
Asthma camp
St. Bridgid's Camp
Camp Kiwanee
Southeast Unitarian Universalist Summer Institute
Anders Behring Breivik
Camp Eagle Ridge

Camp Deer Run is a Christian summer camp for girls located on Lake Winnipesaukee in NH.
 It was started in 1964 on the property of Camp Brookwoods a summer camp for boys.
 Camp sessions are either two or four weeks long.
 First time campers under the age of 10 can participate in a one-week explorer club program designed to introduce your child into the wonderful adventure of summer camp.
Camp TA-RI-GO was a summer camp on Little Red Kill Road in Fleischmanns, New York (a village in the town of Middletown), in the Catskill Mountains off Route 28.
 It was a Jewish summer camp for several hundred boys and girls from before 1937 until its final season: 1976.
YMCA Camp Mason is a YMCA summer camp located in Hardwick Township, New Jersey.
 The 650 acre site is located next to the Delaware Water Gap National Recreation Area.
 Camp Mason annually serves approximately 800 campers in its summer camp programs, and 7,000 participants at its outdoor center.
Adrian Pracon (born December 8, 1989) is a youth politician from Norway who was the last person to be shot by Anders Behring Breivik during the 2011 Norway attacks in Utøya, an attack which he survived.
Asthma camp is a summer camp that is specialized for children with severe versions of asthma.
 Typically categorized as a special needs summer camp.
 The camp counselor role is fulfilled by respiratory therapists and registered nurses in order to provide a safe and positive experience for children who would otherwise not be able to go to a summer camp.
 Asthma camps aim to provide a positive experience for children with asthma through activities like hiking, swimming, canoeing, rope games, arts and crafts, campfires and more all with special considerations and attention to asthma.
 Children that attend asthma camps tend to have improved asthma self-management skills and an increase in overall quality of life.
St. Bridgid's Camp or St. Bridgid's Summer Camp or sometimes commonly misspelled St. Bridgit's Summer Camp is a small summer camp located near on the shores of Lac Manitou located on Highway 105 and is around 75 km from Ottawa, Ontario.
 The camp has cabins in which the campers can sleep in each having 9 bunk beds(For 8 campers and 1 counselor for each cabin).
 It also has a deck with benches for easy gatherings and a basketball hoop.
 Swimming is probably by far the camp's best feature, with the camp allowing the children to swim in Lac Manitou and lifeguards that stand by for safety.
 The camp also has a "world-famous" mud-pit where the children (given the mud-pit is open) can drench themselves in mud until they are all grey and can then go and wash off in the lake.
 It also has an area with picnic tables and a dining hall, which is where breakfast, lunch and supper are eaten.
 The dining hall also has washrooms.
 Registration is available around Late April to Early May.
 During the camp's two peak months(July and August), the camp features a month where only boys are allowed to attend (July), and a girl's month (August), when only girls are allowed to attend.
Camp Kiwanee is a summer camp and function facility at 1 Camp Kiwanee Road in Hanson, Massachusetts.
 The core of the property is a summer estate called "The Needles" which was built by industrialist Albert Cameron Burrage between 1899 and 1905.
 This property was purchased by the Boston chapter of the Camp Fire Girls, and adapted for use as a girls' summer camp.
 From the 1930s to the 1950s a series of recreational facilities was constructed, and the camp was enlarged by the purchase of adjacent properties.
 The Town of Hanson purchased the camp from the Camp Fire Girls in 1979, and continues to operate it as a campground and function facility.
Southeast Unitarian Universalist Summer Institute (SUUSI) is an intergenerational community of approximately 1,000 people who gather each July.
 They describe themselves as a Unitarian Universalist (UU) summer camp.
 People attending SUUSI predominantly abide by the teachings of Unitarian Universalism, but many participants belong to other denominations or faiths.
 Attendees range in age from newborn to elderly.
Anders Behring Breivik (] ; born 13 February 1979), known as Fjotolf Hansen from 2017, is a Norwegian far-right terrorist who committed the 2011 Norway attacks.
 On 22 July 2011 he killed eight people by detonating a van bomb amid Regjeringskvartalet in Oslo, then shot dead 69 participants of a Workers' Youth League (AUF) summer camp on the island of Utøya.
 In August 2012 he was convicted of mass murder, causing a fatal explosion, and terrorism.
Camp Eagle Ridge is a leadership-based coeducational summer camp located in Mellen, Wisconsin on Lake Galilee.
 It was founded in 1994.
 The camp accepts children aged 7–17.
 It has been accredited by the American Camp Association.
 The camp is a mid-size summer camp with an occupancy limit of 90 campers.
 This camp is a sleep away camp, but children do have the option of being taken home instead of sleeping there.
 Food is provided and on the weekends trips or special activities are offered.
 There are 5 usually 4 cabins open to the boys and 5 usually 4 open to the girls spree are from each other.
 Dance are also a special activity on Friday.
 There are 2, 4, and 6, week stay time offered.