MANILA - A local burger joint's one-day only promo has caused pandemonium in various malls early Monday, as seen in social media posts by customers who documented their experience.

Several Facebook posts showed hundreds of customers crowding outside Zark's Burgers outlets, hoping to avail of the P8 burger.

The promo, according to Zark's Facebook page, was to mark its 8th year anniversary and was open only to the first 80 customers. While the promo started at 10 a.m., many customers lined up as early as 7 a.m.

Pauline Cabal Estrada posted a video of a massive crowd in SM Sta. Rosa, where people were pushing and shoving their way to the burger outlet in the hopes of availing the promo.

In SM Bacoor, Kent Pontivedra's video showed people rushing to line up outside the burger outlet. Pontivedra lamented that the restaurant and mall had no crowd control in place.

"Kami ang aga aga nmin pumila 7:00 am pa. Dapat kung sino unang dumating papasukin at papilahin agad kung saan yung Zark's Burger," he said in his post.

Meanwhile, RJ Rebagoda posted a video in SM Sta. Rosa, where security guards could be seen attempting to hold off a huge crowd trying to get inside the burger outlet.

In a Facebook post, Zark's Burger has apologized for the "inconvenience" to its customers.

"We sincerely apologize for the inconvenience experienced by patrons and other mall shoppers unintentionally brought about by this celebration that was intended to thank all of you for 8 years of loyal support and patronage," it said.