Regarding your questions about "concerted efforts," yes, you interpreted them correctly. "Across Asia" means all parts of Asia (e.g., China, Korea, Japan, Vietnam, etc.).
"Injured" and "wounded" mean the same thing: the writer uses synonyms to make the paragraph more interesting (using the same word all the time is boring to the reader). A police mosque is, I assume, a mosque where the police can pray five times per day, located on the grounds of a police station.
Yes, "concern" usually takes the preposition "about," but the phrase "expressed concern over..." is also correct.