Israeli Prime Minister Ehud Olmert says a crackdown against Hamas will continue, after an Israeli man was killed by a rocket fired from
"No-one involved in terror has immunity," Mr Olmert told his Cabinet.
The Israeli man died after shrapnel hit him in the neck in the town of
About 40 people have been killed in
Mr Olmert hinted that any Israeli action would be open-ended.
"We are not acting according to any timetable that is dictated externally. We will decide where, how and to what extent we act," he said.
One other Israeli civilian has been killed and 16 wounded by rockets fired on Israeli towns, particularly Sderot, in recent days.
According to the Israeli army, more than 230 rockets have been fired from
Mr Olmert's spokeswoman said that
"If somebody in the hierarchy is involved in terrorism, they should not feel safe," said Miri Eisin.
'Pointless'
On Saturday
The arrest follows the detention on Thursday of Education Minister Nasser al-Shaer and about 30 other officials in the
Attempts by Palestinian leader Mahmoud Abbas, who belongs to the rival Fatah faction, to revive a ceasefire with
Sami Abu Zuhri, a Hamas official, said such hopes were "absurd", because Mr Olmert's "threats and the continued Zionist escalation makes any talk about calm pointless".
Hamas has warned that any Israeli attack against the group's military or political leaders would make the release of Israeli Corporal Gilad Shalit more uncertain.
Cpl Shalit has not been heard from or seen since his capture in
Photo caption
Israeli Prime Minister Ehud Olmert/file photo