Possibly related:

‘Loud explosion’ heard in Derry city centre, Waterside area:
[link to www.thejournal.ie]

3 killed, 39 injured in explosion at Moscow restaurant:
[link to www.rferl.org]

Father, daughter hurt when home's basement explodes in rural Harrisburg:
[link to www.argusleader.com]

Docked 56-foot boat explodes at Port Townsend:
[link to www.peninsuladailynews.com]

Vacant building explodes in Indianapolis:
[link to www.theindychannel.com]

North Austin home explodes, 1 killed:
[link to www.myfoxdfw.com]