The Akash missile is a DRDO-developed system and has been in service for over a decade now with multiple advanced versions of the missile under development by the Akash Team.
The recent explosion occurred after the Philippine military's announcement that they had killed 11 terrorists, including members of the Dawlah Islamiyah-Philippines, which is a pro-Islamic State organisation.
China threatened Philippines after Philippine Coast Guard said it removed the floating barrier that was deployed by China in the contested waters of the South China Sea
"This latest attempt to legitimize China's purported sovereignty and jurisdiction over Philippine features and maritime zones has no basis under international law, particularly the 1982 UN Convention on the Law of the Sea (UNCLOS)," a statement by the Philippines government read.
Beijing has been trying for years to prevent the Philippine Navy's resupply missions in Ayungin Shoal and has displayed new tactics over the past few months.