Israeli aircraft have fired missiles at militant facilities in the Gaza Strip, killing a Palestinian civilian and wounding 25 other people, Gaza officials say.

The airstrikes early on Friday, confirmed by the Israeli military, followed Israeli air attacks a day earlier that killed two Islamic militants and touched off rocket fire from Gaza on southern Israel.

The rockets caused no casualties but further ratcheted up friction in the volatile border area between Israel and Gaza.

Gaza rescue officials said three separate airstrikes took place in Gaza City against training facilities of the militant Hamas group that rules the densely populated seaside territory.

One set a nearby house on fire, destroying it and killing a 42-year-old civilian man, identified by health official Adham Abu Salmia as Bahajat Zaalan.