It is understood several men, including a taxi driver, have been arrested since last Wednesday's kidnap.
Authorities say Joshua Hakken tried and failed to kidnap them at gunpoint from the home.
"I have emails where our children's lives have been threatened with kidnap, " said Mrs Roberts.
Aspinall was jailed for life in December 1992 for raping a minor and kidnap.
They kidnap migrant workers, mainly from Central America, and demand ransom from their impoverished families.
They were allegedly on their way to kidnap one of Bollywood's top stars, Manisha Koirala.
The court was told they decided to kidnap him, however he later broke free.
Mike Thomson travelled to the heart of the kidnap region in northern Sinai to report.
Guerrillas have escaped with kidnap victims five times in the past couple of months.
Valle, 28, was arrested on October 24, and charged with conspiracy to kidnap a woman.
There are 21 South Korean missionaries still captive after their kidnap on July 19.
Bellfield, 42, denies murdering her, and also denies attempting to kidnap another girl the day before.
Kidnap-for-ransom groups are prevalent in the southern Philippines, according to the BBC's Kate McGeown in Manila.
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The remainder of those killed were kidnap victims whose bodies were recovered by police.
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"There are Central American migrants in the organised crime groups that kidnap migrants, " Mr Plascencia said.
Anti-kidnap marches are planned for 30 August, a sign of the growing public fury.
The group was held responsible for the kidnap of more than 30 European tourists in Algeria.
The Klarsfelds found Barbie in Bolivia and helped organise his extradition in 1983, after first conspiring to kidnap him.
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Philemon has now made his way to Cairo, home to hundreds of former kidnap victims like him.
Mr Valle, 28, is charged with conspiracy to kidnap and with using police databases to research targets.
At the time, he said that his opposition to the proposal to kidnap the imam was overruled.
Set in Philadelphia, the story depicts two orphaned brothers who kidnap a wealthy man, played by Baldwin.
On Monday, police in Venezuela detained five Colombians suspected of involvement in the kidnap of Mr Ramos.
The media coverage of the fifth anniversary of Schalit's kidnap devoted no attention to his Palestinian captors.
Today he had a feeling that the Nethers might kidnap Suzanne Bledsoe, the new girl in homeroom.
He was charged with plotting to murder, kidnap or maim persons overseas and provide material support to terrorists.
Mexico's Supreme Court has said a Frenchwoman jailed for 60 years for kidnap should not be freed immediately.
Kidnap, too, is a common crime in Ayutla, a profitable sideline for the drug cartels and organised crime.
Ms. ROUG: It is headed by a Sunni, although witnesses said that there were also Shia kidnap victims.
Many people in this kidnap-happy province naturally want to hold on to their weapons for their own protection.
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