The source of the cyclosporiasis outbreak, which has spread across at least 34 states, is unclear.
Experts say there were likely multiple points of contamination in the US food supply - complicating investigations.
Buttigieg says the day he spent separated from his twins was "among the darkest hours of my life".
The US and Canada say they need to resolve "outstanding issues" before the cross-border project, seen as a symbol of binational cooperation, opens.
Body cam footage shows the moment a baby was thrown from a window and caught by an officer during a house fire.
Energy prices are rising as US peace talks with Iran appear to have stalled, with the key Strait of Hormuz waterway still effectively closed.
Constant spring rainfall and melting ice have flooded the state's Black Lake and surrounding neighbourhoods.
At the annual 'Great Marshmallow Drop', more than 15,000 fluffy treats fell from a helicopter as kids raced to collect them.
Prior to the attack, the suspect searched online for pro-Hezbollah news channels and for large gatherings of Israelis in Michigan, the FBI said on Monday.
