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Michael Horn's departure, effective immediately, was by "mutual agreement," a statement from the company says.

Also: Protests build in Egypt; gay pride events set across the U.S.; Obama pledges $7 billion to upgrade Africa's power systems; Kerry leaves Middle East, saying peace talks are "within reach;" and Google Reader is about to disappear.

Wongel Estifanos was visiting Glenwood Caverns Adventure Park during Labor Day weekend while vacationing with her family, officials say.

Sales of super-efficient electric heat pumps are rising in the U.S. But what are heat pumps? And why do some call them a key climate solution?

Some states have enacted so-called Amazon taxes, forcing the giant online retailer to collect sales taxes the same way traditional stores do. In those states, Amazon's sales fell about 10 percent.

Companies are increasingly using algorithms to set their prices, but is that giving them too much power over consumers?

Also: U.N. envoy calls for transitional government in Syria; former President George H.W. Bush remains hospitalized; and talks to avoid an East Coast port strike resume.

Also: Search for more murder victims ends in Cleveland; earthquakes kill dozens in China; torrential rains flood Phoenix; Pope Francis heads to Brazil; Phil Mickelson wins the British Open.

Also: Immigration bill to be unveiled soon; Dish bids $25.5 billion for Sprint; a nice guy finishes first at the Masters; and it's tax day.

Also: Opening statements due in trial of George Zimmerman for death of Trayvon Martin; NSA leader Edward Snowden thought to still be in Russia; another large wildfire continues to spread in Colorado.