A Google spokesperson has confirmed to us that Nexus 5 production has stopped, warning that "once they are gone, they're gone, so we'd suggest people get them while they can".
The confirmation came after we approached Google about the red and white versions of the Nexus 5, which have been completely removed from the Google Play Store.
At present only the black version of the Nexus 5 is showing up on the Google Play Store, but at the time of writing both the 16GB and 32GB versions were out of stock.
The Nexus 5 is still available for sale on Google Play and through select retailers. However, as it looks like Nexus 5 production has stopped, there will only be limited amounts of the handset left.