German police say more threatening letters containing a white powder – determined to be non-harmful – have been sent to the American and Israeli embassies in Berlin.

Police spokesman Martin Halweg said Tuesday letters were sent to both embassies on Aug. 22 and to the U.S. Embassy on Aug. 30. They contained a white powder that turned out to be washing detergent, and rambling letters.

Halweg says the suspect in the threats is known to authorities and is the same person who sent similar letters to the two embassies in July.

He says authorities are organizing psychological counseling and possibly inpatient care for the individual.

(AP)