SATURDAY (SEPT 17)
Three incidents on Saturday put the United States on terror alert:
Seaside Park, New Jersey [9.30am local time, 9.30pm Singapore time]
In New Jersey, less than 160km south of New York, a pipe bomb exploded in a trash can on the sidelines of a Marine Corps run in the morning, causing no injuries but forcing the cancellation of the race.
The device consisted of three pipe bombs tied together, with a flip phone used as a timing mechanism.
Minnesota mall stabbing [8pm local time]
Also on Saturday, an assailant reported to be Somali-American went on a stabbing spree in a mall in St Cloud, Minnesota, injuring nine people before being shot dead by an off-duty police officer.
A terrorist-linked news agency claimed that an Islamic State "soldier" carried out the Minnesota stabbing.
Manhattan, Chelsea blast [8.30pm]
A deafening blast reverberated through the Chelsea district of Manhattan on 23rd Street, a block of mostly commercial spaces at street level with residential floors above.
The bomb went off outside the Associated Blind Housing facility which provides housing, training and other services for the blind. The Flatiron Building, a New York landmark, is about 500m away.
It sprayed shrapnel on bystanders and caused serious property damage. One person suffered serious injuries and the rest suffered various cuts, scrapes and other minor injuries from shattered glass and other debris.
Manhattan, West 27th Street [around midnight]
A sweep of the neighborhood following the blast had turned up another device four blocks away consisting of a pressure cooker with wires attached to it and connected to a cell phone.
SUNDAY (SEPT 18)
Earlier on Sunday
All 29 people injured in the bombing in New York released from hospital.
New York state Governor Andrew Cuomo said: "A bomb exploding in New York is obviously an act of terrorism, but it's not linked to international terrorism. In other words, we find no ISIS connections."
The motive was unknown and there has been no claim of responsibility.
Heavily armed police and National Guard soldiers were deployed throughout New York as as world leaders were due to gather at the UN General Assembly on Monday.
Federal Bureau of Investigation investigators were examining remnants of the bomb, an unexploded device found four blocks away, and a pipe bomb that exploded in New Jersey on Saturday to see if they were connected.
Elizabeth,New Jersey [8.30pm - 12.30am]
Suspicious devices were found in a backpack in a wastebasket in the town of Elizabeth.
One of them exploded as a bomb-detecting robot attempted to disarm it, shortly after 12.30am on Monday.
Two men had found the backpack. Thinking that it contained valuables, they had carried it about 1,000 feet (300m) before becoming exhausted by its weight.
Verrazano-Narrows Bridge, Manhattan [9.30pm]
Five suspects were detained for questioning. All or most of them may have been from the same family and they may have been on their way to the airport, said police.
MONDAY (SEPT 19)
The picture that emerged on Monday morning (Monday night Singapore time) was that three incidents - in New York, the pipe bombing in Seaside Park on Saturday and the discovery of the IEDs in Elizabeth - may be connected.
New York City [8.30am]
The New York Police Department said on Twitter it is looking for a 28-year-old man identified as Ahmad Khan Rahami for questioning in connection with the explosion in New York City.
Rahami was born on Jan 23, 1988, in Afghanistan. His last known address was in Elizabeth, New Jersey.
Governor Andrew Cuomo, who said on Sunday that the attack did not appear to have a link to international terrorism, said new evidence might change that thinking.
New Jersey [11.30am]
Rahami was reportedly arrested after a shootout.