Elon Musk appeared to make another dig at rival Jeff Bezos over a report that Musk's attention is drifting away from Tesla

• Elon Musk appeared to make another jab at one of his main rivals, Amazon CEO Jeff Bezos.
• "Give my regards to your puppet master," Musk told The Washington Post.
• That seemed to be a reference to Bezos' ownership of The Post.

It appears that the Elon Musk-Jeff Bezos feud is still raging.

The two tech moguls have recently been $4, but they also have $4 that began over their competing outer-space ambitions. It seems Musk hasn't forgotten.

$4 published a report on Tuesday about how the demands on Musk's time - including his travel schedule, $4, and focus on SpaceX, his rocket company - were affecting Tesla, leading to criticism of his management of the business.

While reporting the story - which The Post said was based on interviews with a dozen current and former Tesla employees, investors, and analysts - the publication reached out to Musk by email and received a brief response.

"Give my regards to your puppet master," Musk said.

The comment appeared to be a reference to $4 - he bought the paper in 2013 $4.

Both Bezos and The Post have repeatedly said he has no influence on editorial decisions. But that hasn't stopped critics from conflating the billionaire tech founder and the nearly 150-year-old publication, the most vocal among them former President Donald Trump. As president, Trump $4, tweeting that the paper spread "fake news" and served as Amazon's "chief lobbyist."

With this latest barb, Musk is adding fuel to a rivalry with Bezos that dates back to at least 2004. Over the past 15 years, Musk has leveled a string of criticisms at Bezos and his rocket company, Blue Origin. He's called Bezos a copycat over some of his business ventures, described Amazon as a monopoly, and appeared to make some digs at Bezos' age.

For his part, Bezos has repeatedly critiqued SpaceX and Musk's goal of sending humans to Mars - Bezos has described the idea as "un-motivating."

"Go live on the top of Mount Everest for a year first and see if you like it, because it's a garden paradise compared to Mars," Bezos $4.