BAGHDAD, Iraq (CNN) -- The female bomber who killed five people just outside the heavily fortified Green Zone on Monday was mentally disabled and her explosives vest was triggered by remote control, an official said.

A man nspects the wreckage of a bus destroyed by a female suicide bomber on Monday.

Baghdad Operations Command spokesman Brig. Gen. Qassim Atta said the strike is the latest example of insurgents' using mentally disabled female bombers to launch attacks.

The most prominent example of the tactic was the deployment of mentally disabled female bombers last February at Baghdad pet markets, attacks that killed 99 people.

Monday's bombing -- one of a string of blasts in the capital that killed a total of 19 people -- occurred outside one of the main entrances to the Green Zone, an Interior Ministry official said. Along with two Iraqi soldiers and three civilians who died, 12 other people were wounded.

The district, which is also known as the International Zone, houses Iraqi government offices and the headquarters of U.S. forces in Iraq. The Iraqi parliament -- located in the district -- is expected to vote this week on an agreement that determines the terms of U.S. troops' presence in Iraq after the U.N. mandate on their presence expires at the end of this year.

Also Monday morning, a roadside bomb struck a bus in eastern Baghdad, killing at least 13 people and wounding seven others, an Interior Ministry official said. The victims were on their way to work at the Ministry of Trade. Atta said the bomb was attached to the bus, an example of magnetic improvised explosive devices, or sticky bombs, that have been used by militants in recent months.

In the morning's third deadly attack, another roadside bomb went off in eastern Baghdad. It targeted a police patrol, an Interior Ministry official said.

One civilian was killed and five injured. Three of the wounded were police officers.

CNN's Jomana Karadsheh contributed to this report.

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