Pakistan's navy has successfully test-fired missiles and torpedoes from ships, submarines and aircraft in the Arabian sea, officials say.
The tests were followed by a statement saying they sent a "clear message to forces having nefarious designs".
India and Pakistan regularly test their missile systems and they normally notify one another ahead of such tests.
Last month the two sides held their first formal talks since the November 2008 Mumbai attacks.
India says the attacks, which left 174 people dead - including nine gunmen - were partly planned on Pakistani soil.
It is not clear if the missiles tested on Friday were capable of carrying nuclear warheads.
The tests included anti-surface missiles, air-to-surface missiles, and surface-to-surface missiles, the AP news agency reported.
Last month India successfully tested a nuclear-capable surface-to-surface missile.