Engler, of New Jersey, to be a Member of the Chemical Safety and Hazard Investigation Board for a term of five years, vice William E.
He said pressure on the Assad regime has been an obstacle to a fair U.N. investigation of the use of chemical weapons.
But before Washington acts, the president has said there needs to be a thorough, "prudent" investigation to determine who got chemical munitions and how they got them, when they were used and how they were used.
This is precisely why it is important to get the United Nations investigation team onto the ground in Syria and make sure it can conduct an independent and professional investigation in the areas where chemical weapons have allegedly been used.
He said the Federal Bureau of Investigation has asked his firm for the chemical composition of the fireworks it sold to the elder Mr. Tsarnaev, which the company has provided.
In a separate development, UN Secretary General Ban Ki-moon said he was waiting for the Syrian government to allow a team of chemical weapons experts into the country for an expanded investigation following an attack on a village outside Aleppo in March.
BBC: Syria crisis: Bashar al-Assad says West will 'pay price'
Some of the initial chemical analysis would be done in a mobile field laboratory during the investigation.
"The coalition condemns all use of chemical weapons, whoever uses them, and it will pursue its investigation and collect evidence on this issue to present to the international commission of inquiry, " a statement said.
An investigation has begun to find out how 10 litres of the chemical bitumen was spilt by the firm redeveloping Guernsey's Airport.
The U.S. Chemical Safety Board said in a news release that it was deploying a "large investigation team" to the scene of the fire and explosion.
Officials are saying there is some evidence of the use of chemical weapons but the US has talked about the need for further confirmation and a UN investigation before being sure.
BBC: Syria chemical weapons claims: UK and US tread cautiously
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