Is this a common expression, especially the underlined part?
I watched on the news that prices are getting higher and higher in the city.
Is it more common to use, “I heard on a TV news program that”?
I saw on the news that prices are getting higher and higher in the city.
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I saw on the news that prices are getting higher and higher in the city.
"I watched ... that" is not correct English. Instead you would say "I saw .... that".
"I heard ... that" is OK.