¿Israel fires first rockets into Gaza since November as fragile ceasefire breaks¿ Defence minister says Israel will not sit back and take cross border attacks Strikes were first by Israel since series of attacks in November Action was triggered by Palestinian rocket and mortar raids on Israel Israel has launched a series of military strikes against Gaza in retaliation to rocket attacks by Palestinian militants. The country's defence minister Moshe Yaalon said Israel will not sit back and take cross border raids on its territory after its military took out a number of targets. The strikes were the first military action by Israel since an eight-day exchange of attacks in November. It comes after militants fired rockets and mortars into southern Israel. Attacks: Israel has launched military strikes against Gaza in retaliation to attacks by Palestinian militants Fighting: The military strikes are the first by Israel since a fragile ceasefire following a series of cross border attacks in November. Here armed Hamas militants attend a funeral in Hebron Mr Yaalon's remarks came as two rockets fired from the coastal territory exploded at an Israeli border town, according to police. Code Red sirens wailed in Sderot at about 7:30 a.m. local time warning of incoming rockets and forcing the town residents who were on their way to work or school to take cover. No injuries were sustained in the attack. Hours earlier, Israel struck targets in Gaza in response to Palestinian rocket attacks. It was the first time Israel retaliated for Gaza rocket fire since an informal cease-fire ended eight days of cross-border strikes between Israel and the Hamas-ruled territory in November. That round of fighting was triggered in part by almost daily Palestinian rocket and mortar attacks on southern Israel. Defiant: Israeli defence minister Moshe Yaalon said his country will not tolerate cross border attacks on its territory Palestinians in Gaza have fired several rockets since an informal cease-fire took hold after the fighting. Two rockets were fired during President Barack Obama's visit to Israel two weeks ago. The Israeli military says that, of the five rockets fired in the past day, three hit Israel while another two exploded prematurely inside Gaza. 'We will not allow shooting of any sort towards our citizens and our forces,' Mr Yaalon said in a statement. He said he holds the Islamic militant group Hamas responsible for all rocket attacks from Gaza, which it has ruled since 2007. Israel's chief military spokesman, Brig Gen. Yoav Mordechai, echoed his sentiments to Israel Radio. He said Israel 'will not tolerate' returning to the days before the fighting in November where Palestinian rocket attacks were common. 'Our goal is to keep southern Israel quiet,' he said. During eight days of violence in November, the Israeli military said 1,500 rockets were fired at Israel, including the first from Gaza to strike the Tel Aviv and Jerusalem areas. The rocket attacks killed six Israelis and wounded dozens. Israeli airstrikes killed 169 Palestinians, many of them militants, and caused considerable damage. The spokesman meanwhile said the military is on alert for 'riots' in Palestinian areas over an autopsy planned for later in the day for a Palestinian prisoner who died of cancer in an Israeli jail the day before. Palestinian officials said Israel was responsible for the death of Maysara Abu Hamdiyeh, charging medical negligence. Battle: Militants have fire rockets across the border into Israel in recent days - which has led to retaliatory strikes The 64-year-old was serving a life sentence for his role in a foiled attempt to bomb a busy cafe in Jerusalem in 2002. Spokesman Mordechai however said the Palestinian Authority was exploiting his death to 'resume popular protests.' Prisons Authority spokeswoman Sivan Weizman said Abu Hamdiyeh was treated well by Israeli specialists and died in a hospital in Beersheba. Fears: Tensions between Israel and Palestinian militants show little sign of abating She said the prison service asked the parole board for the prisoner's early release after his cancer was diagnosed as terminal last week, but the appeal was still being processed at the time of his death. Ms Weizman said almost all of the 4,600 Palestinian prisoners detained by Israel refused their breakfasts Wednesday morning in a symbolic act of protest. As news of Abu Hamdiyeh's death spread Tuesday, Palestinian prisoners in several jails began banging on their cell doors and hurling objects. Later, protests spread to Jerusalem and parts of the West Bank where protestors hurled fire bombs and rocks at soldiers. Tensions are high in Israeli jails, where thousands of Palestinian security prisoners are being held. Some have held hunger strikes and Palestinians have held large protests demanding their release. After decades of conflict with Israel, the issue of prisoners is emotionally charged in Palestinian society. Inmates are widely esteemed by Palestinians regardless of the reasons for their incarceration, which range from mass murder to throwing rocks. Prisons: Tensions are high in Israeli jails, where thousands of Palestinian security prisoners are being held