The explosions happened around 6:30 p.m. on September 21, 2013 in two restrooms inside the Walmart store located at 263 Walmart Drive in Camden, Delaware.
The investigation led authorities to the arrests of 21-year-old Malcolm A. Casson and 20-year-old Bradford Joshua Husfelt.
Casson and Husfelt are each charged with two felony counts of Manufacturing and Use of an Explosive Device, two felony counts of Conspiracy 2nd degree, and two counts of Reckless Exploding.
Casson was committed to the James T. Vaughn Correctional Center in lieu of $6,000 bail. Husfelt was released on a $12,000 unsecured bond.
State fire investigators say minimal property damage was inflicted on the store and there are no reported injuries.