Explosions have shaken the house of a senior Palestinian militant leader in southern Gaza. Witnesses said they were caused by an Israeli missile strike.
The apparent strike came after a bloody weekend in northern Gaza
At least five Palestinians were wounded, two critically.
Local Islamic Jihad leader Ahmed al-Sheikh Khalil - who lost an arm in a previous attempt on his life - was out at the time, said a group spokesman.
The explosions come after Israeli missile strikes in northern Gaza caused several deaths over the last two days.
A Palestinian schoolteacher and a gunman died in separate missile strikes on Jabaliya refugee camp on Sunday. On Sunday and Monday three gunmen died of injuries sustained in Israeli strikes, hospital officials said.
It is estimated that more than 100 Palestinians have been killed since Israel began its operation in northern Gaza in late September.
The offensive is meant to put a stop to rocket attacks on Israel from inside Gaza.
Israeli military sources say they have no information about the series of explosions that rocked Mr Khalil's house in the Rafah refugee camp in southern Gaza.
But residents said the initial explosion was caused by an Israeli missile. They said subsequent blasts happened as bombs kept inside the house went off.
Islamic Jihad sources and medics said Mr Khalil had escaped the strike but that two of his brothers were among the wounded.
This contradicted early reports that Mr Khalil had been injured.
"Sheikh Khalil is in good shape... and he will remain a thorn in the throat of the Jews and will teach them a lesson as he has done before," local Islamic Jihad spokesman Abu Abdel Rahman told Israeli newspaper Haaretz.
Mr Khalil lost an arm in a previous attempt on his life and lost a leg in an accident while working with explosives.