US Defence Secretary Ashton Carter arrived in Madrid, beginning a European tour amid alarm over Russian bombardments in Syria and the refugee crisis sparked by the conflict.
President Barack Obama has voiced anger and sadness over "routine" mass shootings in the United States after 10 people were killed in an attack at a community college in Oregon.
American R&B singer Chris Brown thanked New Zealand women's advocates for supporting his plan to perform in the country, despite a domestic violence conviction which could see him banned.
Research into brain diseases such as Alzheimer's, Parkinson's and traumatic injury got a boost with a $100 million pledge from a US foundation and seven universities.
US presidential candidates took time from campaigning to reflect on Thursday's deadly mass shooting at an Oregon college, with Democrat Hillary Clinton calling for "sensible" gun law reform.
Students at a US college in Oregon where 10 people were killed by a lone gunman described scenes of panic and terror as they ran for their lives or hid in classrooms.
The State Department released a new batch of 6,300 pages of emails sent or received by Hillary Clinton when she served as top US diplomat and controversially used a private email account.
Republican US presidential front-runner Donald Trump said that he would send thousands of Syrian refugees back to their home country if he is elected in November.
Russia will propose a United Nations Security Council resolution on fighting "terrorism", deputy foreign minister Mikhail Bogdanov was quoted as saying by RIA Novosti news agency.