US President Trump appoints Robert O'Brien, his chief hostage negotiator and an established figure in Republican policy circles, for new role after firing his hawkish aide John Bolton.
Police identified the suspect as a white man in his mid-30s, but could not yet name him or say why he carried out the attack in the West Texas cities of Midland and Odessa.
How white supremacist mass murders have become an organised transnational security threat.
Alejandro Giammattei will succeed corruption-tainted outgoing President Jimmy Morales, who leaves office in January.
Five days after 22 people were killed at a Walmart store in El Paso, Texas, panicked shoppers fled a Walmart in Springfield, Missouri, after a man carrying a rifle and wearing body armor walked around the store before being stopped.
Hundreds sang, chanted and toted signs at a rally in El Paso, Texas, to protest white supremacy, demand gun control and make it clear that they were not pleased President Donald Trump was in town.
The onset of the Trump administration has coincided with an increasing level of hate crimes and an emboldened white nationalist movement that has created a domestic terrorism crisis in the US.
Cloudflare CEO Matthew Prince describes the no-censorship site as "a cesspool of hate." Right-wing extremists, misogynists and conspiracy theorists freely post to 8chan, which does not moderate content.
Top Republican leaders rallied around Trump, but four members of the president's party voted with the 235 Democrats to condemn him for "racist comments that have legitimised and increased fear and hatred of new Americans and people of colour."
At least two transgender women have been murdered with four more cases unsolved.
The Trump administration remains adamant on detaining migrants in what many activists describe as "concentration camps."
The plane was heading for St. Petersburg, Florida and was carrying two flight crew and eight passengers, Vice Chairman of the National Transportation Safety Board (NTSB) Bruce Landsberg said.
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