The UK competition regulator on Wednesday announced the launch of an antitrust investigation into Microsoft's proposed $68.7 billion acquisition of video gaming giant Activision Blizzard.
### Instruction: What is the sentiment of this news? Please choose an answer from {negative/neutral/positive}
### Input: The UK competition regulator on Wednesday announced the launch of an antitrust investigation into Microsoft's proposed $68.7 billion acquisition of video gaming giant Activision Blizzard.
### Response: mildly negative