Indie rockers Death Cab for Cutie [ tickets ] continue to pile on dates for their run behind the forthcoming "Narrow Stairs," including an extensive new summer leg.

The Seattle band kicks off its spring outing April 18 in Bremerton, WA, a trek that now looks to take a two-week break in mid-May before coming back strong with a stretch that gets started May 24 in Portland, OR, and runs through late June. The new dates bookend the group's June 15 slot at Manchester, TN's Bonnaroo [ tickets ] festival. Details are listed below.

"Narrow Stairs," the group's first studio effort since 2005's Grammy-nominated "Plans," will hit stores May 13. The album--the band's second major-label release--was produced by Death Cab's guitarist, Chris Walla; a streaming version of the just-released lead single, "I Will Possess Your Heart," can be found at the band's MySpace page.

"I hope this album is a bit of a surprise for those out there that think they have us all figured out," bassist Nick Harmer said in a press statement. "We can't wait to share these songs with the world."

The band was the target of an April Fool's joke earlier this month, when a prankster "leaked" a copy of "Narrow Stairs" onto the Internet, according to MTV News. After the leak became widespread, sharp-eared listeners discovered that aside from an authentic version of the aforementioned first single, the purported new Death Cab songs were actually taken from German band Velveteen's new album "Home Waters."

"Yeah, I heard about this--someone sent me a MySpace message saying we had been part of an April [Fool's] joke," Velveteen frontman Carsten Schrauff told the music TV network last week. "Then we started getting more people asking us about it. We had no idea what was happening, but we heard it and started telling people it wasn't Death Cab, it was us they were hearing. It's pretty unbelievable."