NEW YORK (AP) – Americans are commemorating 9/11 with mournful ceremonies, volunteering, appeals to “never forget” and rising attention to the terror attacks’ extended toll on responders. A crowd of victims’ relatives is expected at ground zero Wednesday. President Donald Trump is scheduled to join an observance at the Pentagon. Vice President Mike Pence is to speak at the third attack site, near Shanksville, Pennsylvania. Here in Washington, services will be held at the 9/11 Memorial in the parking lot of the Old Washington Mall in South Strabane Township. The service will begin at exactly 8:46 a.m., the time the first plane hit the World Trade Center. Nearly 3,000 people were killed in the hijacked-plane attacks on Sept. 11, 2001.