A wave of attacks by Islamic State (IS) militants in Egypt's Sinai Peninsula has left at least 50 people dead, security and medical sources say.
Near-simultaneous raids were launched on at least five military checkpoints and a police station in and around Sheikh Zuweid on Wednesday morning.
Clashes were continuing in the area hours later, with militants reportedly roaming the northern town's streets.
It is one of the largest co-ordinated assaults yet by militants in the Sinai.
Jihadists based in the restive region stepped up their attacks after the military overthrew Islamist President Mohammed Morsi in July 2013. At least 600 police and armed forces personnel have since been killed.
In a separate development on Wednesday, security officials said nine members of Mr Morsi's now banned Muslim Brotherhood, including former MP Nasr al-Hafi, had been killed in a police raid on a flat in western Cairo.
The security situation in Egypt has worsened since the assassination of the public prosecutor, Hisham Barakat, two days ago in the capital.