Your comments on ...

Suspect arrested in US over Obama ricin letter

Police cordon off the area in front of the White House in Washington, DC, on April 17, 2013. A letter addressed to President Barack Obama has tested positive for ricin, and authorities have arrested a suspect, stoking alarm in Washington after an earlier A letter addressed to President Barack Obama tested positive for ricin, and authorities arrested a suspect, stoking alarm in Washington on Wednesday after an earlier scare over poisoned mail.