By Timothy Gardner WASHINGTON (Reuters) - President Barack Obama on Wednesday will visit Flint, Michigan, a city struggling with the effects of lead-poisoned drinking water, as questions linger over whether his environmental regulators could have acted more urgently to address the crisis. Obama will get updates from federal officials on the response in Flint, a mostly African-American city where more than 40 percent of the city's 100,000 people live in poverty. "Like you, I'll use my voice to call for change and help lift up your community," Obama wrote last week to Amariyanna Copeny, an eight-year-old Flint girl who has marched in protests about the crisis and had asked to meet him.
US Secretary of State John Kerry warned Syria's Bashar al-Assad of "repercussions" if his regime flouts a new truce under negotiation, as talks to halt the violence shifted to Berlin on Wednesday. Russia has said a new ceasefire to halt fighting in Aleppo could be imminent, with Syria's divided northern city hit by a wave of violence that has killed more than 270 people since April 22. With the UN Security Council to meet on the crisis later Wednesday, diplomatic efforts to stem the violence shifted to Berlin, where German Foreign Minister Frank-Walter Steinmeier was to hold talks with UN Syria envoy Staffan de Mistura, Syria's main opposition leader Riad Hijab and France's top diplomat Jean-Marc Ayrault.