News bites: Yahoo buys Tumblr

Yahoo CEO Marissa Mayer announced that her company has bought Tumblr.

Chinese hackers have resumed their attacks on U.S. computer systems, The New York Times reports. 

Europe cited China's Huawei and ZTE for trade violations, according to Reuters. 

The CEO of The Associated Press called the government's seizure of his organization's phone records unconstitutional, the AP writes. 

Federal officials searched a Fox News reporter's emails after obtaining a warrant, The Washington Post reports.