As the news of explosives being sent to prominent Democrats was breaking, White House Press Secretary Sarah Sanders tweeted their official statement. It wasn't written as a tweet, but as a picture posted in a tweet - it was 157 characters too long to tweet. The picture looked familiar.
That's the iPhone Notes App; the official statement about bombs being sent to high-level members of the Democratic Party, including the Obamas, the Clintons and Eric Holder wasn't drafted on official White House letterhead and released to the media, it was written with an iPhone app and tweeted.
If you're not familiar with the iPhone Notes app, or don't recognize it, I wrote the exact same message on mine and it's identical.