Instagram's co-founders announced their resignations on Monday, but the creative duo hinted about a possible collaboration in the near future.

Instagram CEO Kevin Systrom and co-founder Mike Krieger will step down from the company they founded eight years ago to “explore curiosity and creativity again,” according to a statement.

"Mike and I are grateful for the last eight years at Instagram and six years with the Facebook team,” Systrom said. “We’ve grown from 13 people to over a thousand with offices around the world, all while building products used and loved by a community of over one billion."

They expect to depart within the next few weeks, according to the statement.

There was no explanation for the sudden departure and Facebook, which acquired the photo-sharing app for $1 billion in 2012, said it wished them well.

“Kevin and Mike are extraordinary product leaders and Instagram reflects their combined creative talents,” Facebook CEO Mark Zuckerberg. “I've learned a lot working with them for the past six years and have really enjoyed it. I wish them all the best and I'm looking forward to seeing what they build next.”

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@mikeyk and I are grateful for the last eight years at Instagram and six years with the Facebook team. We’ve grown from 13 people on the team to over a thousand with offices around the world, all while building products used and loved by a community of over one billion. We’ve loved learning to scale a company and nurture an enormous global community. And we couldn’t have done it without our amazing Instagram team, and the support of @zuck, @sherylsandberg, @schrep, and @chriscox at Facebook - we’ve learned so much from all of you. Now, we’re ready for our next chapter. We’re planning on taking some time off to explore our curiosity and creativity again. Building new things requires that we step back, understand what inspires us and match that with what the world needs; that’s what we plan to do. We remain excited for the future of Instagram and Facebook in the coming years as we transition from leaders to just two users in a billion. Thank you for being part of Instagram’s community. It’s been (and will continue to be) an honor ????

A post shared by Kevin Systrom (@kevin) on Sep 24, 2018 at 9:57pm PDT

Systrom did not say if he planned to create another app in the near future, but he signaled that he and Krieger could be working together soon.

“We’re planning on taking some time off to explore our curiosity and creativity again,” Systrom said. “Building new things requires that we step back, understand what inspires us and match that with what the world needs; that’s what we plan to do.

“We’re now ready for our next chapter,” he added.