"when suspected" is correct and can be used in written English.
For example: The police initiated an investigation when suspected criminal activity was taking place.
When suspected of radicalism, Tamerlan Tsarnaev was hardly subject to abusive or oppressive treatment.
When suspected research misconduct involves federal funding, the University must adhere to additional regulations, policies, procedures and reporting requirements.
A group of Muslims protected Christian passengers when suspected Islamic extremists ambushed a bus in Kenya, according to eyewitness accounts.
Pediatricians, emergency medicine physicians, and other primary care providers are often the first to evaluate children when suspected shunt complications occur.
The Anuradhapura blast followed an incident on September 29th, when suspected Tamil rebels set off a bomb in a car park in the capital, Colombo, wounding three people.
The father of an 18-month-old Palestinian child who was burnt alive when suspected Jewish extremists firebombed the family home has died after sustaining severe burns.
His activities as court painter ended in 1644, when, suspected of the murder of his wife, he had to escape to Valencia.
In a separate incident, two security forces personnel were killed and two were wounded when suspected guerrillas lobbed a grenade in the Dalgate area of Srinagar.
It subtly compares Verónica's silent disavowal of responsibility for any crime she might have committed with that country's silence during its dictatorship, when suspected dissidents disappeared.
The potential for violence became apparent early Friday when suspected Islamist militants attacked security forces in at least four sites in the tumultuous northern Sinai Peninsula region, according to local news reports that cited security officials.
The most recent major attack in Saudi Arabia came in November, when suspected Qaeda members used a bomb-laden car to blow up a housing compound in Riyadh, killing 18 people and wounding more than 100 others.
