A number of large explosions were reported in Gaza City late Monday night, but the cause of the blasts was not yet confirmed.

Gazan civilians were reporting on Twitter that the Israeli navy fired several shells after Hamas members launched a round of “experimental” rockets off the Gaza coast. These accounts have not been confirmed.

According to Israeli news site Walla, the IDF’s spokesperson’s office said Israel was not involved in the explosions and the incidents seemed to be “internal.”

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There were initial reports that at least four Hamas members were injured in the rocket launching.

Update: Initial explosion was Hamas testing rocket, resulted in 4 injuries. Then Israeli navy opened fire towards Gaza,no injuries 1241am — OccPal-Gaza (@OccPalGaza) March 9, 2015

https://twitter.com/FPalestinepsp/status/575061501083439104