DES MOINES, Iowa (AP) -- Police and a Des Moines legislator won't provide details about an envelope filled with white powder that caused a four-hour lockdown of the Statehouse.

State patrol officers stopped anyone from entering or leaving the Statehouse on Tuesday evening after Rep. Ako Abdul-Samad opened an envelope at his desk in the House chamber and powder spilled out. The envelope also contained a letter that House Speaker Kraig Paulsen termed threatening.

On Wednesday, Iowa State Patrol Captain Mark Logsdon noted it would be several days before tests are completed on the powder. Until then, investigators won't say anything about the material.

Abdul-Samad is one of only five blacks and one of two Muslims in the House. He wouldn't detail the letter but gave the impression it related to his race and religion.