Question: When in 2017 did the chemical attack happen in one of the home countries of foreigners living in the country where Bengt Lagerberg's group comes from?

<P0-S0> Bengt Lagerberg (born 5 July 1973), is best known as the drummer in the Swedish rock band The Cardigans. <P0-S1> He is currently living in Malmö. <SEP> <P1-S0> The group's line-up has been very stable, the only change being that their post-hiatus shows since 2012 have been with Oskar Humlebo on guitar instead of Svensson. <P1-S1> The Cardigans are a Swedish rock band formed in Jönköping, Sweden, in 1992 by guitarist Peter Svensson, bassist Magnus Sveningsson, drummer Bengt Lagerberg, keyboardist Lars-Olof Johansson and lead singer Nina Persson. <SEP> <P2-S0> russia entered the cwc with the largest declared stockpile of chemical weapons. <P2-S1> by 2010 the country had destroyed 18,241 tonnes at destruction facilities located in gorny (saratov oblast) and kambarka (udmurt republic), where operations have finished, and shchuchye (kurgan oblast), maradykovsky (kirov oblast), leonidovka (penza oblast) while installations are under construction in pochep (bryansk oblast) and kizner (udmurt republic). <P2-S2> by 2016, russia destroyed around 94% of its chemical weapons, planning to completely destroy its remaining stockpile by the end of 2018. on september 27, 2017 russia announced the destruction of the last batch of chemical weapons, completing the total destruction of its chemical arsenal, ahead of schedule.on march 4, 2018, russia was alleged to have conducted a chemical attack in salisbury, uk that left 5 injured including the alleged target of the attack, sergei skripal. <SEP> <P3-S0> Between 1820 and 1930, approximately 1.3 million Swedes, a third of the country's population at the time, emigrated to North America, and most of them to the United States. <P3-S1> There are more than 4.4 million Swedish Americans according to a 2006 US Census Bureau estimate. <P3-S2> In Canada, the community of Swedish ancestry is 330,000 strong.There are no official statistics on ethnicity, but according to Statistics Sweden, around 3,193,089 (31.5%) inhabitants of Sweden were of a foreign background in 2017, defined as being born abroad or born in Sweden with at least one parent born abroad. <P3-S3> The most common countries of origin were Syria (1.70%), Finland (1.49%), Iraq (1.39%), Poland (0.90%), Iran (0.73%) and Somalia (0.66%). <P3-S4> Sweden subsequently has one of the oldest populations in the world, with the average age of 41.1 years. <SEP> <P4-S0> At the time of the attack, the town was under the control of Tahrir al - Sham, previously known as the al - Nusra Front. <P4-S1> The Khan Shaykhun chemical attack took place on 4 April 2017 on the town of Khan Shaykhun in the Idlib Governorate of Syria. <SEP> <P5-S0> in the aftermath of the 2011 libyan civil war, militant attacks have increased due to a large influx of weapons and fighters into the region. <P5-S1> neighbouring mali faced conflict in azawad that threatened to split the country. <P5-S2> since 2015, burkina faso has faced cross-border attacks and sporadic raids in its territory, the result of instability and unrest in neighboring countries. <P5-S3> two major attacks have occurred in the capital ouagadougou in recent years: in 2016, attacks on a hotel and restaurant killed 30 people, including foreigners; and in 2017, similar attacks killed 19 people, including foreigners. <P5-S4> both of these attacks were carried out by al-qaeda in the islamic maghreb.burkina faso also faced an uprising in 2014 leading to the downfall of president blaise compaoré later that year. <P5-S5> burkina faso is a member of the trans-saharan counterterrorism partnership and its commitment of peacekeeping troops in mali and sudan has made it a target for extremists in the region.