However, the Iraqi army said early Monday that no rocket had been fired, AFP reported.
Some reports said a Katyusha rocket was fired at a “US base” inside the Baghdad International Airport.
The projectile fell in the vicinity of the airport on Sunday without either exploding or leaving any human losses, Iraq’s al-Sumaria television network reported.
Saudi-owned al-Arabiya al-Hadath channel cited “sources” as saying that the rocket targeted the American base inside the airport.
No group or person has claimed responsibility for the incident.
It came just a day after a rocket struck a building near the heavily fortified Green Zone in the Iraqi capital, which houses some government offices and foreign diplomatic missions, including the US embassy.
The back-to-back incidents come in the wake of a controversial US test of a Patriot missile system inside the Green Zone.
Baghdad strongly condemned it, with Deputy Parliament Speaker Hassan Karim al-Kaabi saying that by conducting the test, Washington just added to the mass of its provocations and illegal actions in Iraq.