UPDATE, 3:30 p.m.: An update from the Associate Press has been posted »

BOSTON -- There are numerous reports of explosions injuring a number of people near the Boston Marathon finish line Monday afternoon.

The reports began shortly before 3 p.m.

Here is a collection of posts by major news outlets to Twitter over the past several minutes:

@reutersus: "Boston marathon headquarters locked down after explosion reported near finish line: spokesman."

@BostonGlobe: "Two powerful explosions detonated in quick succession right next to the Boston Marathon finsh line this afternoon."

CBS3 Springfield reporter Chris Stewart: "Shards of glass, scaffolding, barriers, scattered across the ground. Fairmont Copley Plaza Hotel has been shut down."

WBZ reporter Jim Armstrong: ""Being kept far from scene. Suggestions we stay away from trash cans."

WGBH reporter Anne Mostue: "With @ebherwick3. We're safe. People screaming, running tape."

This is a developing story. Details will be posted as they become available. Below, a live video feed from WBZ:

Boston Marathon Finish Line