All variations apart from those involving a news are valid, but they're not completely interchangeable.
When television is used without an article, it generally refers collectively to the entire system involved in transmitting/receiving television broadcasts. To the extent that actual television receivers are relevant to such usages, we're generally talking about more than one. Thus OP's versions referencing news on television are unlikely, since the implication is that the crowd are using the medium of television to watch the news - probably on several different (hand-held?) televisions.
If television is preceded by an article, the implication is there's only one television, which all the people are watching. Whether it's a or the simply depends on whether earlier context has already identified that specific television set.
Having said that, idiomatically people often include the article even when it's certain more than one television set is involved...
I chatted on the phone to her last night while we watched Coronation Street on the television.
Most speakers today wouldn't use the article there (it's reminiscent of an older generation who thought of the television as a unique/remarkable piece of new technology). It's not "wrong", just a bit "dated".
As regards news, the situation is somewhat more complex. Most commonly, it's the news, because we conceptualise it as a specific program being broadcast. So, for example...
"Did you see the news last night?" (normal English)
"Did you see news last night?" (unlikely, would be considered "invalid" by most native speakers)
But there are contexts where the speaker thinks of news as a more "generic" concept...
"I don't watch the news on television. I keep up-to-date through radio and the Internet"
"I don't watch news on television. I keep up-to-date through radio and the Internet"
It's hard to argue there's any real semantic difference between the above. With the article (probably the way most people would express it), I'm saying I don't watch any of the specific news programs. Without the article, I'm saying I don't watch news programs in general. But in practice they mean the same thing.
In OP's context, the crowd would normally be watching the news - largly because that's idiomatically the more common form. But if in the context of his narrative the actual content of the news broadcast is irrelevant, the article could validly be dropped. Since the article normally is present, its absence would normally be interpreted as implying that the crowd are simply watching news in general, rather than a news bulletin concerning something of relevance to his narrative.