Colombian president Juan Manuel Santos announced on Monday that his government will sign a cease-fire deal with the leftist National Liberation Army (ELN) after months of peace talks with the rebel group.

The cease-fire will take effect on 1 October and would last until 12 January, in order to allow the government of Colombia and the small insurgent group time to negotiate a permanent deal. The ELN and its larger sister guerilla group, the FARC, launched their violent war against the Colombian state in 1964. Both groups share responsibility for about 260,000 civilian deaths, 23,000 kidnapped and disappeared civilians, and the forced internal displacement of 6.7 million Colombians.

While working for the global management consulting company Accenture, Gregory Falco discovered just how vulnerable the technologies underlying smart cities and the “internet of things” — everyday devices that are connected to the internet or a network — are to cyberterrorism attacks. His focus is on cybersecurity for urban critical infrastructure, and the internet of things, or IoT, is at the center of his work. A washing machine, for example, that is connected to an app on its owner’s smartphone is considered part of the IoT. There are billions of IoT devices that don’t have traditional security software because they’re built with small amounts of memory and low-power processors. This makes these devices susceptible to cyberattacks and may provide a gate for hackers to breach other devices on the same network.

The threat of terrorism in Europe has been on the rise in recent years, with experts and politicians particularly worried that terrorists might make use of dirty bombs. Researchers have developed a new system that will be able to detect possible carriers of radioactive substances, even in large crowds of people. This solution is one of the defensive measures being developed as part of the REHSTRAIN project, which is focused on security for TGV and ICE high-speed trains in France and Germany.

White supremacy is woven into the tapestry of American culture, online and off. Addressing white supremacy is going to take much more than toppling a handful of Robert E. Lee statues or shutting down a few white nationalist websites, as technology companies have started to do. We must wrestle with what freedom of speech really means, and what types of speech go too far, and what kinds of limitations on speech we can endorse. In 2003, the Supreme Court ruled, in Virginia v. Black, that “cross burning done with the intent to intimidate has a long and pernicious history as a signal of impending violence.” In other words, there’s no First Amendment protection because a burning cross is meant to intimidate, not start a dialogue. But what constitutes a burning cross in the digital era?

Extreme speech on social media—foul language, threats and overtly sexist and racist language—has been in the spotlight. While such language is not new, recent increases of extreme and offensive posts on social media have led to politicians, celebrities and pundits calling for social media platforms to do more in curbing such speech, opening new debates about free speech in the digital age. A new study shows that while people tend to dislike extreme speech on social media, there is less support for outright censorship. Instead, people believe sites need to do a better job promoting healthy discourse online.

Vehicular terrorist attacks are becoming “more commonplace around the globe.” Terrorists are increasingly relying on low-sophistication tactics like car-ramming and stabbing to kill or injure large groups of people without easy detection or intervention by law enforcement. These assailants often target locations where large numbers of people congregate, particularly on or around major national holidays, when civilians are likely to be outdoors shopping or celebrating.

Today, 23 August, is celebrated in Europe as the European Day of Remembrance for Victims of Stalinism and Nazism. It is also called Black Ribbon Day. It commemorates the signing the neutrality pact between Nazi Germany and the Soviet Union – a pact which led, a week later, to the joint invasion and division of Poland by the two powers — the opening move of the Second World War. “Extremism, nationalism, xenophobia and hatred can still be heard in public speech in Europe,” the European Commission said earlier today. “Keeping these memories alive is not only a tribute to the victims but also a way to ensure that these ideologies can be forcefully rejected and such atrocities never happen again.”

The use of social media by a diversity of violent extremists and terrorists and their supporters has been a matter of concern for law enforcement and politicians for some time. While it appears that Twitter is now severely disrupting pro-IS accounts on its platform, our research found that other jihadists were not subject to the same levels of take down. The migration of the pro-IS social media community from Twitter to the messaging service Telegram particularly bears watching. Telegram currently has a lower profile than Twitter with a smaller user base and higher barriers to entry, with users required to provide a mobile phone number to create an account. While this means that fewer people are being exposed to IS’s online content via Telegram, and are thereby in a position to be radicalized by it, it may mean that Telegram’s pro-IS community is more committed and therefore poses a greater security risk than its Twitter variant.

An open letter by 116 tech leaders from 26 countries urges the United Nations against opening the Pandora’s box of lethal robot weapons. The open letter is the first time that AI and robotics companies have taken a joint stance on the issue. “Lethal autonomous weapons threaten to become the third revolution in warfare,” the letter states. “Once developed, they will permit armed conflict to be fought at a scale greater than ever, and at timescales faster than humans can comprehend. These can be weapons of terror, weapons that despots and terrorists use against innocent populations, and weapons hacked to behave in undesirable ways. We do not have long to act. Once this Pandora’s box is opened, it will be hard to close.”