CBS Corp. is finishing up a round of cuts of both full time and part time employees at CBS News programs and bureaus across the country. The reduction also includes not filling open positions.

Tipsters tell us that staffers in Washington DC, New York, Los Angeles, San Francisco and Miami were all cut. Nine employees ranging from producers, to electronic maintenance personnel, a secretary and a courier have been let go in Washington. Four staffers from “The Early Show” were cut as were 11 employees working in the L.A. and San Francisco bureaus.

Daniel Sieberg, CBS News Science and Technology correspondent, was laid off today. He’d been with the network for three years.

When first reported, the total number of layoffs was estimated to be around 100 staffers but a CBS insider tells us it is “considerably less” than that.

A CBS News spokesperson would not comment on the staff reductions.

> More: From the NYObserver‘s Felix Gillette – By Monday afternoon, staffers from Washington to L.A. were sputtering in disbelief as they heard of top producers on the chopping block – particularly Mark Katkov and Jill Rosenbaum in D.C. and Roberta Hollander and Barbara Pierce in L.A. These were seasoned veterans, part of the old school known back in the Dan Rather days as “the Hard Corps.”