A wave of apparently co-ordinated bomb attacks in the Iraqi capital, Baghdad, has killed at least 63 people and injured around 185, say officials. The interior ministry told the BBC 14 locations had been attacked, including al-Amil in the south and Halawi and Karrada closer to the centre. The bombings are the worst in months - and follow the withdrawal of US troops. They come amid fears of rising sectarian tensions as the unity government faces internal divisions. It was not immediately clear who was behind the attacks. However, analysts say the level of co-ordination suggests a planning capability only available to the Sunni insurgent group, al-Qaeda in Iraq. A security spokesman in Baghdad, Major General Qassim Atta, said the attackers had not aimed at security targets. "They targeted children's schools, day workers and the anti-corruption agency," he told the AFP news agency. Raghad Khalid, a teacher at a kindergarten in Karrada, said all their windows had been blown out. "The children were scared and crying. Some parts of the car bomb are inside our building." Smoke was seen rising over Karrada district, with ambulances rushing to the scene. Another woman said her baby had been covered in glass. "She is now scared in the next room. All countries are stable. Why don't we have security and stability?" said Um Hanin. Political turmoil Iraq's year-old power-sharing government is in turmoil after an arrest warrant was issued for Sunni Vice-President Tariq al-Hashemi on terror charges. The entire al-Iraqiyya group, the main Sunni bloc in parliament, is boycotting the assembly in protest. It accuses Iraqi Prime Minister Nouri Maliki, a Shia, of monopolising power. Mr Hashemi denies the charges. He is currently in Irbil in Iraqi Kurdistan, under the protection of the regional government, but Mr Maliki has demanded that they give him up. A BBC correspondent in the region, Jim Muir, says in the current heated political climate many Shias will see the bomb attacks as Sunni acts of revenge for the charges Mr Hashemi faces. The last American troops departed from Iraq on Sunday, nearly nine years after the war that toppled Saddam Hussein in 2003. President Barack Obama acknowledged that the situation was not perfect, but said the US forces were leaving behind "a sovereign, stable and self-reliant Iraq, with a representative government elected by its people".