The suspects who blew up a bomb and planted another device in New York could have used construction work to hide from CCTV cameras, DailMail.com can reveal.

An analysis of the locations of both devices reveals that both were covered overhead by scaffolding and a temporary cover above the sidewalk.

The cover would have made it extremely hard for a camera to see what is going on underneath, especially at night when incident took place.

Pictured is a view of a mangled dumpster at the site of an explosion that occurred on Saturday night in the Chelsea neighborhood of New York City

Police work near the scene of an explosion in Manhattan's Chelsea neighborhood

The cover on West 23rd St, where the bomb went off, runs for much of the block.

The cover on West 27th St, where the second device was found, runs for a shorter distance but still conceals the sidewalk where the device was left.

Avoiding being caught on CCTV could have been a deliberate tactic of the attackers; in the wake of the Boston Marathon bombing in 2013 police released images of suspects they were seeking to the public.

The photos went viral and, in part thanks to an army of online sleuths, they played a major role in apprehending the culprits, brothers Dzhokhar and Tamerlan Tsarnaev.

CNN reported that at this stage the NYPD does not have any ‘good’ footage of the bombing in Manhattan and does not have any footage of any suspects.

At a press conference NYPD Commissioner James O’Neill appealed for witnesses and asked anyone with more footage to come forward.

The blast happened at 8.30pm on Saturday on West 23rd Street as it was packed with tourists and residents out visiting bars and restaurants on a warm late summer’s evening.

A pressure cooker with wires and a mobile phone attached to it - was found on West 27th St

The explosion shattered glass, sent debris flying and people running for their lives. Witnesses said it looked like a ‘volcano’ and sounded like thunder.

The second device - a pressure cooker with wires and a mobile phone attached to it - was found two hours later on West 27th St.

Police have said that the explosion happened outside the Associated Blind Housing building at 135 West 23rd St.

The large building is currently undergoing renovations and images from Google Streetview from June this year show the covered pedestrian walkway that had replaced the sidewalk.

Pedestrians would have to walk under a covered section for around 300ft and would not emerge until a long way up the block.

A picture of 27th St posted on Twitter by Mazdack Rassi shows that the device was left under some scaffolding there too.

He also posted a live video on Periscope showing how the NYPD bomb squad robot grabbed the device and took it away.

The NYPD has increasingly relied on its network of more than 3,000 CCTV cameras which is known the ‘Ring of Steel’ similar to that used in London.

The system is considered one of the most advanced in the world and is mainly focused on the area beneath Canal Street, although Midtown and Chelsea are well covered.

Police and firefighters are pictured on Saturday night. Police have said that the explosion happened outside the Associated Blind Housing building at 135 West 23rd St

Police arrive on the scene of an explosion in Manhattan's Chelsea neighborhood

The NYPD does rely on camera footage from individual shops but given there is construction along much of the north side of 23rd St, there are not likely to be cameras there.

The best footage so far is from the Orangetheory fitness center, which is on the south side of West 23rd St.

It did capture the moment the bomb went off and shows a white flash as it exploded.

People can be seen running for their lives as they scream into their phones - moments before they were calmly walking along the street.

In the top left hand corner a large orange explosion is visible on the North side of 23rd St.

The second device was found a photographer who told DailyMail.com that she thought it was a ‘kids’ science experiment they were throwing out.

Jane Schreibman, 66, lives on 27th Street between 6th and 7th Avenues said that a friend called her around 10 pm Saturday to tell her that an explosion had rocked the Chelsea neighborhood.

She came out of her house, walked 10ft and saw a ‘strange contraption - a pot with wires coming out of it’, she said.