Twelve people were killed and 20 injured following a suicide bomb attack in the north-eastern Nigerian town of Potiskum.
There was no immediate claim of responsibility for the blast but it bore the signs of similar attacks by Nigeria's home-grown Boko Haram Islamic extremist group.
In a separate attack in Kano, two male suicide bombers left a vehicle at the Kano Line bus station, before detonating themselves.
In Potiskum, bus driver Adamu Isa said the man forced himself onto the bus and blew himself up.
In the same town on Sunday a girl who looked about 10 carried explosives that detonated, killing herself and four others at a market.
Thousands of people have been killed in the five-year-old uprising to enforce strict Islamic law in Nigeria.
Boko Haram now controls vast swathes of north-east Nigeria and has displaced more than three million people.
The mounting threat of the Islamist insurgency has already led to the postponement of February's presidential elections, with the vote now due to take place on 28 March.
The delay is designed to give the Nigerian military time to re-establish its presence in the north-east.
However, opponents of President Goodluck Jonathan have claimed that the delay is actually a political tactic.
Why are you making commenting on The Herald only available to subscribers?
It should have been a safe space for informed debate, somewhere for readers to discuss issues around the biggest stories of the day, but all too often the below the line comments on most websites have become bogged down by off-topic discussions and abuse.
heraldscotland.com is tackling this problem by allowing only subscribers to comment.
We are doing this to improve the experience for our loyal readers and we believe it will reduce the ability of trolls and troublemakers, who occasionally find their way onto our site, to abuse our journalists and readers. We also hope it will help the comments section fulfil its promise as a part of Scotland's conversation with itself.
We are lucky at The Herald. We are read by an informed, educated readership who can add their knowledge and insights to our stories.
That is invaluable.
We are making the subscriber-only change to support our valued readers, who tell us they don't want the site cluttered up with irrelevant comments, untruths and abuse.
In the past, the journalist’s job was to collect and distribute information to the audience. Technology means that readers can shape a discussion. We look forward to hearing from you on heraldscotland.com
Comments & Moderation
Readers’ comments: You are personally liable for the content of any comments you upload to this website, so please act responsibly. We do not pre-moderate or monitor readers’ comments appearing on our websites, but we do post-moderate in response to complaints we receive or otherwise when a potential problem comes to our attention. You can make a complaint by using the ‘report this post’ link . We may then apply our discretion under the user terms to amend or delete comments.
Post moderation is undertaken full-time 9am-6pm on weekdays, and on a part-time basis outwith those hours.
Read the rules hereComments are closed on this article