New York (AP): Twitter has threatened legal action against Meta over its new, text-based app called Threads, according to a letter obtained by Semafor.

In a Wednesday letter addressed to Meta CEO Mark Zuckerberg, Alex Spiro, an attorney representing Twitter, accused Meta of unlawfully using Twitter's trade secrets and other intellectual property by hiring former Twitter employees to create a "copycat" app.

Since launching Threads Wednesday night, Meta's new app has collected tens of millions of sign ups. The app, which was created by the company's Instagram team, arrives at a time when many are looking for Twitter alternatives to escape Elon Musk's raucous oversight of the platform since acquiring it last year for USD 44 billion.

Meta spokesperson Andy Stone responded to the report of Spiro's letter on Threads Thursday afternoon, writing, "no one on the Threads engineering team is a former Twitter employee that's just not a thing".

In the letter, which Semafor first reported on Thursday, Spiro said that Twitter "intends to strictly enforce its intellectual property rights" and noted the company's right to seek civil remedies or injunctive relief. He added that the letter marked a "formal notice" for Meta to preserve documents relevant for a potential dispute between the companies.

The Associated Press reached out to Spiro and Twitter on Thursday for further information. Twitter responded to an email seeking comment with a poop emoji, its standard automated response to reporters.

Musk hasn't directly tweeted about the possibility of legal action, but he has replied to several snarky takes on the Threads launch. The Twitter owner responded to one tweet suggesting that Meta's app was built largely through the use of the copy and paste function, with a laughing emoji.

Twitter CEO Linda Yaccarino has also not publicly commented on Wednesday's letter, but seemingly appeared to address Threads' launch in a Thursday tweet.

"We're often imitated -- but the Twitter community can never be duplicated," Yaccarino wrote.

Still, some analysts say Meta's new app could be a significant headache for Twitter pointing to the excitement surrounding Threads' launch and impressive download numbers so far.

Success for the app isn't guaranteed, of course. Industry watchers point to Meta's track record of starting standalone apps that were later shut down, for example, and note that Threads is still in its early days so time will tell.

Meta's new app has also raised data privacy concerns. While Threads launched in more than 100 countries Wednesday, it is notably unavailable in the European Union, which has strict data privacy rules.

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Tel Aviv, Dec 21: A rocket fired from Yemen hit an area of Tel Aviv overnight, leaving 16 people slightly injured by shattered glass, the Israeli military said Saturday, days after Israeli airstrikes hit Houthi rebels who have been launching missiles in solidarity with Palestinians.

A further 14 people sustained minor injuries as they rushed to shelters when air raid sirens sounded before the projectile hit just before 4 am Saturday, the military said.

The Houthi rebels issued a statement on the Telegram messaging app saying they had aimed a hypersonic ballistic missile at a military target, which they did not identify.

The attack comes less than two days after a series of Israeli airstrikes on Yemen's Houthi rebel-held capital, Sanaa, and port city of Hodeida killed at least nine people. The Israeli strikes were in response to a Houthi attack in which a long-range missile hit an Israeli school building. The Houthis also claimed a drone strike targeting an unspecified military target in central Israel on Thursday.

The Israeli military says the Iran-backed Houthis have launched more than 200 missiles and drones during the Israel-Hamas war in Gaza. The Houthis have also been attacking shipping in the Red Sea and Gulf of Aden and say they won't stop until there is a ceasefire in Gaza.

The Israeli strikes Thursday caused “considerable damage” to the Houthi-controlled Red Sea ports “that will lead to the immediate and significant reduction in port capacity,” UN spokesman Stephane Dujarric said. The port at Hodeida has been key for food shipments into Yemen in its decade-long civil war.

UN Secretary-General Antonio Guterres said both sides' attacks risk further escalation in the region and undermine UN mediation efforts.