Together with the Chilean @nomaslacris we analysed police use of teargas on the 20th of Dec 2019, to repress one of the most intense days of the Chilean protests.
Using a combination of OSI and fluid dynamics simulation is the first to measure airborne and ground deposited teargas concentration, establishing a benchmark.
The entire battle for the #PlazaDignidad roundabout was caught on CCTV camera. We reconstructed the camera’s cone of vision and confirmed its time code using shadow.
Using an automated method of video analysis we marked the extent of each teargas cloud with a frame, and the approximate location of the canister.
Having broken through police barricades, the protesters carry their flag to the center of the roundabout. Following that our system identified at least 82 canisters deployed within a space of 10 minutes.
With the locations of 594 teargas clouds mapped within the model we collaborated with Dr Salvador Navarro-Martinez to simulate and measure levels of toxicity in air and on the ground, considering temperature, wind and humidity.
The concentration of tear gas in the roundabout reached toxicity levels of 40 times the limit specified in Chilean Police’s Manual for Crowd Control risking the lives of protesters.
The wind deposited the CS particles on the ground, and the nearby Mapocho River, which feeds the farms on the southern outskirts of Santiago.
Our analysis supports Chile’s Human Rights Commission complaint against the illegal use of teargas and calls for its ban as a chemical weapon.

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More from @ForensicArchi

21 Dec
Forensic Architecture y el grupo chileno @nomaslacris colaboraron para analizar la represión policial y el uso gas lacrimógeno el 20 de diciembre de 2019, uno de los días más intensos de la represión.
Una combinación de OSI y simulación dinámica de fluídos es la primera en medir la concentración de partículas de gas en aire y suelo, estableciendo un punto de referencia.
La lucha completa por la toma de la #plazadignidad está registrada en cámara. Reconstruímos el cono de visión de la cámara y confirmamos su código de tiempo.
Read 9 tweets
29 Oct
Since the killing of George Floyd, protests against racialized violence by police have been met with further egregious police brutality.

With @bellingcat, we verified & analysed over 1000 incidents of US police violence.

View the interactive data here: blmprotests.forensic-architecture.org
The data we've gathered evidences:

- 400+ attacks on civilians using chemical agents
- 300+ instances of unjustified arrest, detention, and intimidation
- 300+ physical assaults by officers
- 250+ attacks on journalists, medics, and legal observers

And we're still adding more.
Now, we're putting this data at the service of organisations pursuing accountability at a local and national level.

Watch our introductory video here, and visit our website: forensic-architecture.org/investigation/…
Read 5 tweets
19 Oct
1/ Our latest investigation with @rights360 confirms reports that migrants crossing the Evros/Meriç river from Turkey to Greece are beaten, illegally detained, and forcefully expelled by Greek forces, a practice known as “pushbacks”. bit.ly/31gEcXo
2/ We used 3D models to undertake ‘situated testimony’ that helped four victims of pushbacks identify the locations where they were detained and pushed back, and reconstruct their experiences. forensic-architecture.org/investigation/…
3/ Witnesses described and modelled the buildings they were detained in. Using satellite photographs, ground footage and documents we confirmed these locations to be of key sites operated by the Greek authorities.
Read 13 tweets
12 Mar
(1/8) In November 2019, we interviewed people who had been held and mistreated in an obscure detention centre near the village of Poros, #Evros, Greece, before being forcefully and illegally pushed back to Turkey.

vimeo.com/397211174
(2/8) Recently, @nytimes reported on the presence of this centre, bringing a relatively unknown detention facility to international attention: nyti.ms/2Q5Vuko
(3/8) Our methods helped witnesses reconstruct the facility from memory. The process aided their recollection and helped corroborate their testimonies. The models produced from witness memory matched the one we built from satellite images and photos taken on the ground.
Read 8 tweets
10 Sep 18
Our investigation into the murder of Pavlos Fyssas is currently being presented to a court near Athens. Lawyers for the neo-Nazi organisation #GoldenDawn failed to convince the judge to exclude, after they admitted they had not even read the report to which they were objecting.
Fyssas, a Greek anti-fascist rapper, was killed on 18 Sep 2013 by a member of Golden Dawn. Our investigation was first discussed in July, in the courtroom at Korydallos Prison, near Athens. Lawyers for the GD objected strenuously, questioning our credentials.
Fyssas' murder has taken on national significance. 69 leading members of GD - Europe's only neo-Nazi group with seats in a national parliament - are charged with running a criminal organisation. If they are found guilty, GD would lose its 16 seats in Greece's parliament.
Read 8 tweets

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