Smartphone giant Samsung has reportedly stopped production of its Note 7 phone amid claims that replacement devices still have critical battery issues.
Reuters and South Korea's Yonhap news agency cited unnamed officials claiming the company had temporarily halted its Galaxy Note 7 production lines.
Samsung told the BBC it was "adjusting the production schedule to ensure quality and safety matters".
The move came as two US networks stopped replacing or selling the phone.
Samsung said on Monday it would also stagger shipments of the Note 7 to conduct in-depth inspections.
The South Korean firm issued a recall of the smartphone in September and assured customers last month that the fixed devices were safe.
But there have now been several reports of replacement phones starting to emit smoke.
'No longer exchanging'
It comes after the AT&T and T-Mobile networks in the US said they would no longer replace the devices, while the latter said it would halt all sales of the phone.
"While Samsung investigates multiple reports of issues, T-Mobile is temporarily suspending all sales of the new Note 7 and exchanges for replacement Note 7 devices," T-Mobile said on its website.
Meanwhile, AT&T said: "We're no longer exchanging new Note 7s at this time, pending further investigation of these reported incidents." It advised customers to exchange them for other devices.
Samsung said in a statement last month that the issue of overheating was caused by a "rare" manufacturing error that resulted in the battery's "anode-to-cathode [negative and positive electrodes]" coming into contact.
But last week, a domestic flight in the US was evacuated after a replacement Note 7 started emitting smoke in the cabin. And a man in Kentucky reportedly woke up to a bedroom full of smoke from a replaced Note 7.
In an update on Monday, Samsung said it understood the concerns of carriers and consumers about the newly released replacement Note 7 devices.
"We continue to move quickly to investigate the reported case to determine the cause and will share findings as soon as possible," Samsung said.
"If we conclude a product safety issue exists, we will work with the CPSC (US Consumer Product Safety Commission) to take immediate steps to address the situation."
Shares in Samsung Electronics closed down 1.5% in Seoul.
Eric Schiffer, a brand strategy expert at Reputation Management Consultants, said the company needed to take action to limit the harm to its image.
"If the Note 7 is allowed to continue, it could lead to the single greatest act of brand self-destruction in the history of modern technology," he said.
"Samsung needs to take a giant writedown and cast the Note 7 to the engineering hall of shame next to the Ford Pinto."
In 1977, the Pinto was the subject of a then-record US recall to address safety concerns.
After reports that some Samsung Galaxy Note 7 devices have been catching fire, Samsung has decided to halt sales and recall any device that has been bought so far. Additionally, the US government has initiated an official Note 7 recall, which will affect approximately 1 million devices.
So if you've just got your hands on the new smartphone, read on to find out how you can replace your Samsung Galaxy Note 7.
Although so far it appears that only 35 devices have been affected, Samsung has deemed the risks high enough to start a costly global recall, so we'd highly recommend you return your Note 7 for a replacement or a refund.
Ring Samsung's customer service team
Samsung Galaxy Note 7 owners in the UK should ring Samsung's customer service team on 0330 7261000, and they will take you through the process of returning your Galaxy Note 7 for a replacement.
Samsung has confirmed that mobile networks and operators which have already dispatched devices will begin to contact UK customers to arrange returns from September 19. However, we'd recommend using the number above to get in contact first.
In the US you can call the customer service team on 1-800-726-7864 (1-800-SAMSUNG), and in Australia the number to call is 1300 362 603.
You can also start a live chat on Samsung's support website to talk to someone immediately.
If you bought the Samsung Galaxy Note 7 in a store and are concerned you can take it back there for more advice.
Samsung will also be launching websites that let you enter in your device's IMEI number (found in Settings > About Phone) to find out if your Note 7 needs replacing. For more information on checking to see if you need to replace your device, check out our guide on how to make sure you have the new Galaxy Note 7.
US exchange program
Samsung has outlined a Galaxy Note 7 exchange program in the US, saying it will replace phones with either a new Galaxy Note 7 or a Galaxy S7 Edge and replacement of any Note 7 accessories. The company is also offering customers a $25 gift card or credit off their carrier bill.
Swapping out a current Galaxy Note 7 for a new phone could begin as early as next week, but there's no word on when the S7 Edge would begin.
To begin the exchange process, head to the store where you bought your Note 7, or call 1-800-SAMSUNG. While it's good Samsung is acting quickly to exchange phones, the US government is reportedly wary of its efforts as the company didn't go through an official route to initiate the recall.
While this program is for US customers, we should hear about Samsung's exchange programs for the rest of the world soon.
UK exchange program
Samsung has also outlined the process for replacing your Samsung Galaxy Note 7 in the UK. If you bought it from the Samsung online store, contact the support team at email@example.com.
If you bought a Galaxy Note 7 from Carphone Warehouse contact their support phoneline on 0370 111 6565.
You can also ring up your network operator for replacing your Note 7. For EE dial 150 from your mobile. Vodafone customers should dial 191, and Three customers dial 333.
If you're on a contract with O2 dial 202, and if you're on a pay as you go deal, ring 4445 from your handset.
Samsung has said that the exchange of units will begin from September 19, and they encourage anyone with a Galaxy Note 7 to take advantage of the UK Galaxy Note 7 exchange program.
How to replace your walking bomb? Here's how (published by Matt Hanson from TechRadar)
Now that September 19 has passed, Samsung has gone into more depth about the UK and European recall of Galaxy Note 7 devices.
A new software update will be released from September 20 that will limit the battery in pre-ordered Note 7 devices in Europe to 60% charge. This will reduce the risk of devices catching fire, as well as encourage owners to trade in their Note 7 for a new version.
Samsung will also launch a webpage (which has yet to go live) that will allow Note 7 customers to enter in their device's IMEI number, which will tell them if their device needs replacing. The IMEI number can be found by going into Settings > About Phone.