Company Alerts?

Needing more income, I have just invested in a market basket of the stocks of 17 large well-known American companies, so I could receive dividend income.
But, just as BP had been a great company to invest in, the news of a few months ago would have signalled a sell in order to avoid the risk of the company going sour.
I am looking for a web site or a service that can alert me with breaking news that might indicate threat to any of these 17 companies.
Do you know of such a service?
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