Lindsay Lohan's Lifetime movie, "Liz & Dick," investigated by unions

Lindsay Lohan (Elizabeth Taylor) and Grant Bowler (Richard Burton) star in the Lifetime original movie "Liz & Dick."
Lindsay Lohan as Elizabeth Taylor in the Lifetime movie "Liz & Dick."

(CBS/AP) Two Hollywood unions are scrutinizing worker safety and welfare on Lindsay Lohan's TV movie "Liz & Dick" after the actress tweeted that she was exhausted because of long production days.

Larry A. Thompson, the producer of the Lifetime movie, said Wednesday that no violations were found in one union's review.

The Screen Actors Guild-American Federation of Television and Radio Artists confirmed its representatives visited the production. SAG-AFTRA said it "will continue to visit" to enforce guild rules.

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"We have spoken with representatives from the company, and they are fully aware of their contractual obligations. We will ensure that all applicable penalties will be paid," the guild said in a statement.

IATSE, the stage employees union, said it's keeping a watchful eye on the production's working conditions.

"We have had union representatives on the set since last Friday and will continue to monitor the hours and working conditions there," said Mike Miller, IATSE's division director for movie and TV production.

In a statement, Thompson said a SAG-AFTRA representative "was totally fine with everything" she found during shooting Tuesday at a Los Angeles estate. He was told there had been no complaints from guild members and that the visit was prompted by "tweets and comments in the media," he said.

Last week, paramedics were called to Lohan's hotel room after a long day of work on the set of the film. The actress' rep said the 25-year-old was "exhausted" and "dehydrated" after working through the night.

Lohan tweeted that she was exhausted after working "85 hours in 4 days." There were also reports that two crew members also sought treatment for exhaustion, but according to a rep for Thompson, the reports were incorrect.

"Liz & Dick," about Taylor's romance with Richard Burton, is expected to wrap principal photography at the end of June after about four weeks of shooting at Southern California locations standing in for Europe.