A number of Massachusetts-based bands are sending their thoughts and prayers to the victims of Monday's deadly explosions at the Boston Marathon.  

The Pixies, Guster, and Godsmack all posted tweets saying that their hearts are with everyone in Boston, while the Dropkick Murphys tweeted that the city is in their prayers even though they're touring on the other side of the country. 

But Boston rockers aren't the only acts tweeting about the incident.  Grizzly Bear, Grace Potter, and Garbage also sent their condolences via the micro-blogging site, while Thirty Seconds to Mars urged anyone in the Boston area to donate blood following what they called a "senseless and horrible act."