Several explosions echoed across Baghdad this morning, hours before the Iraqi Governing Council was due to sign a transitional constitution.
A loud blast reverberated through the city centre at around 8.30 a.m. (Irish time), rattling windows across the river from the main US headquarters. There were no further details.
Earlier, a US military spokesman said there had been six or seven blasts at Baghdad international airport southwest of the city, where there is a major US base, between 10.15 and 10.30 a.m. There were no reports of damage or injuries.
US bases across the country regularly come under fire from mortars and grenades.
Police in the Ameriyah district in the west of the capital said a roadside bomb had detonated at around 6.30 a.m., leaving a crater in the street but causing no casualties.
The council had delayed the signing for two days out of respect for at least 181 people killed in a series of attacks on Tuesday.
Three people were killed in the capital yesterday in a rocket attack. There are frequent explosions in Baghdad, some caused by roadside bombs planted by insurgents, others controlled by US troops destroying ordnance.