16.36 BST Texas tragedies raise questions about mass killings, political violence Many developments are expected today in the twin tragedies that caused mayhem and misery in Texas over the weekend and raised questions over the frequency of mass killings in America, including via gun violence and politically-motivated aggression. There have been no motives officially disclosed by authorities yet in Saturday’s mass shooting in Allen, near Dallas, where a gunman killed eight and was then shot dead. And in a car crash in Brownsville, south Texas on Sunday, where a vehicle plowed into people outside a migrant shelter. Authorities in Brownsville...