What you need to know Thursday
North Korea in focus as Obama kicks off #nuclear summit in Washington http://i24ne.ws/107dum pic.twitter.com/9jobUj87wi
Chinese president arrives in Washington for nuclear security summit http://xhne.ws/PFQBm #NSS2016 #XiInDCpic.twitter.com/xBPm0nuD5Q
Tornadoes strike Oklahoma as severe weather hits South: http://cbsn.ws/1MDkWbn pic.twitter.com/X42ruwXrQx
At least 10 killed and 150 feared trapped as partially built flyover collapses in #Kolkata http://trib.al/JcOHtbf pic.twitter.com/iIfAwDICm3
#Mexico City temporarily restricts all cars after smog alert http://dnai.in/dgSX pic.twitter.com/R9qnTGYvt4
FDA grants use of an experimental blood test to screen blood for Zika virus, an emergency step: http://apne.ws/1TiQ7ui
Alabama GOPer vows to impeach Gov. Bentley amid affair allegations http://bit.ly/1MTPWyH pic.twitter.com/kcLFFDRlm5
South Africa's main opposition party moves to impeach President Zuma after court ruling http://bbc.in/1VUOuDx pic.twitter.com/vlSdCWLQTm
Assad insists on Syria unity government despite opposition demands http://u.afp.com/ZXWK pic.twitter.com/puc4iAafBI
Today we honor #CesarChavez. Union leader, rabble rouser, profoundly human. #CesarChavezDaypic.twitter.com/SWHC64RbQS