The World Today

In a major new project, more than 150 massacres of Aboriginal clans during colonisation have been mapped online. The map, which goes live this morning, is the result of painstaking research by a team of historians. The site records the locations of the killings, the number of people murdered, and for the first time - multiple evidence sources.

After months of uncertainty, struggling Australian steelmaker Arrium has been bought by a London-based company. Arrium was placed into voluntary administration in April last year, with debts of more than $4 billion. Now, the South Australian and federal governments are hailing the sale as a great outcome for the town of Whyalla and the nation.

Iron ore prices have come off their highs for the year, but steel prices are still riding high. Arrium is a medium sized iron ore miner and its iron ore division returned to profit earlier in the year as prices soared, despite having to contend with volatile iron ore prices. The company still owes a lot of money, but it has the backing of state and federal governments and is being bought by a large group, so the future seems positive.

The Federal Treasurer Scott Morrison has described another speech by the former Prime Minister, Tony Abbott, as political 'background noise'. Fairfax reports that Mr Abbott told a Liberal party function on Monday night that the party is at 'a low ebb' and it needs help because it was forced into a 'second best' budget by the Senate.

US and South Korean troops have fired missiles into the waters off South Korea in what the US military has described as a show of force after North Korea successfully tested an intercontinental ballistic missile called Hwasong 14. The US has also requested a closed-door meeting of the UN Security Council. The Secretary of State, Rex Tillerson, has warned the US will 'enact stronger measures to hold' North Korea accountable, saying 'global action is required to stop a global threat'.

Andrei Lankov, professor of Korean Studies at Kookmin University in Seoul, says whether North Korea is capable of developing a warhead is not known, but it's quite clear they have nuclear weapons. The recent missile reached close to 7,000 km, so Alaska and Darwin are within range. Professor Lankov says Russia and China are proposing a nuclear freeze, with conditions: the US will dramatically reduce military activity on Korean peninsula, and stop regular joint exercises with South Korean military. In exchange, North Korea will stop nuclear and missile tests and negotiations will follow. The professor is sceptical these conditions will be accepted.

Tensions are rising again in Europe, over the flow of asylum seekers from northern Africa. Italy has summoned the Austrian ambassador to protest against plans to block migrants crossing the border into Austria. Vienna is preparing to deploy hundreds of soldiers if the influx of migrants into Italy doesn't slow. The European Commission has laid out plans to help Italy cope with the rise in numbers and has urged all European nations to play their part.

Eight year old Saffie Roussos was the youngest victim of the Manchester terrorist attack, which claimed 22 lives. And, on what would have been her ninth birthday, her family has spoken publicly about their loss. They say they want to make sure their daughter is remembered as a 'stunning', character-filled young girl, who wanted to be famous.

They're a concrete reminder of the heightened terrorist threat, but do concrete bollards installed in the CBDs of cities including Sydney, Melbourne, Brisbane, the Gold Coast and Adelaide make the community safer? Two counter-terrorism experts agree the bollards are a worthy investment. But both worry terrorists in Australia could just opt for suburban centres or regional cities and towns instead.

Women in the Australian tech industry are speaking out about sexual harassment in their community. There's been much discussion about the issue after allegations against the boss of a Silicon Valley based venture capitalist firm were published in a New York Times article. Dave McClure, from the firm 500 Startups, has now resigned.