Today the US government made a move, as the Department of Homeland Securty stopped Dwolla from servicing Mt. Gox’s account. Mt. Gox is the largest bitcoin exchange in the world. Dwolla is an online payment service that was generally regarded as an easy way to convert USD to bitcoin.

Pasted from Reddit:

Just received this e-mail:
As of 12:13 PM on 5/14/2013:
You’re receiving this notice because our systems have indicated that you’ve processed and completed a real-time Dwolla-to-Dwolla payment to Mutum Sigillum LLC (“Mt. Gox”) within the last 24 hours.
Due to recent court orders received from the Department of Homeland Security and U.S. District Court for the District of Maryland, Dwolla is no longer legally able to service Mutum Sigillum LLC’s account.
This is a courtesy email encouraging you to follow up on any uncompleted orders with Mutum Sigillum LLC as Dwolla is now unable to move money to and from Mutum Sigillum LLC’s Dwolla account.
Dwolla is not party to this matter nor does it have any information or further insight into the situation. We strongly encourages those with questions to contact Mutum Sigillum LLC
Note: Dwolla requires a court order before honoring requests such as seizing funds or revoking access to an account.
On behalf of Dwolla, we apologize for this inconvenience.

Here’s another customer service email posted to bitcointalk, confirming the above:

Bitcoin prices have been holding steady at about $115 until today, where it’s been jumping between $109 and $120 on Mt. Gox. Dwolla had been an easy way to convert money into bitcoin – if you need alternatives, try localbitcoins, coinbase, or camp.bx.