An Egyptian police cadet has been killed and two others injured in a drive - by shooting on a highway in the North African country.The shooting took place on Tuesday on the Cairo-Ismailia highway after armed men in a vehicle attacked a security checkpoint and killed the 21-year-old police cadet identified as Ramadan Ibrahim and injured two other security forces. The assailants then fled the scene and Egyptian security forces launched an investigation into the attack. This comes a day after unknown attackers on motorcycle opened fire at Al-Sharq police station in the northeastern city of Port Said, injuring two police officers. Also, on Friday, armed men attacked a military checkpoint in Cairo's Al-Marg district, killing a 23-year-old man and wounding a police officer. According to reports, two of the attackers were arrested by Egyptian security forces. Egypt has been facing insecurity since the ouster of former President Mohamed Morsi by the army on July 3. Militant groups have also stepped up their attacks on members of Egyptian security forces ever since. On September 19, authorities in Egypt grounded several metro lines in Cairo after finding unexploded bombs on the tracks in a station. Egyptian security officials in the capital said that bomb experts were sent to Helmeyet el-Zaytoun station in northeast Cairo to search the tracks for more possible explosive devices. Moreover, the surge in violence prompted Cairo to launch a major offensive against the militants and send thousands of troops backed by tanks and heavy equipment into the Sinai Peninsula.